Standard Lemma guide

FOIL

name · noun · verb · 34 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • US: Recorded audio is listed in the source snapshot.
  • /fɔɪl/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -ɔɪl
  • CMU ARPABET: F OY1 L Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

name

Meaning 1

An acronym for the algorithm for multiplying two binomials.

Definition source: English Wiktionary via Wiktextract

Usage: mnemonic

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A very thin sheet of metal.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A very thin sheet of plastic.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Qualifier: chiefly Euro English

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

Thin aluminium/aluminum (or, formerly, tin) used for wrapping food.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Examples

  • wrap the sandwich up in foil

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A thin layer of metal put between a jewel and its setting to make it seem more brilliant.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

In literature, theatre/theater, etc., a character who helps emphasize the traits of the main character and who usually acts as an opponent or antagonist, but can also serve as the sidekick of the protagonist.

Definition source: English Wiktionary via Wiktextract

Usage: countable, figuratively, uncountable

Topics: authorship, broadcasting, communications, film, journalism, literature, media, publishing, television, writing

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

Anything that acts by contrast to emphasise the characteristics of something.

Definition source: English Wiktionary via Wiktextract

Usage: countable, figuratively, uncountable

Examples

  • 1725-1726, William Broome, The Odyssey Hector has also a foil to set regard

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

A very thin sword with a blunted (or foiled) tip.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: fencing, government, hobbies, lifestyle, martial-arts, military, politics, sports, war

Examples

  • 1784-1810, William Mitford, History of Greece Socrates contended with a foil against Demosthenes with a sword.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

A thin, transparent plastic material on which marks are made and projected for the purposes of presentation. See transparency.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

noun

Meaning 10

A premium trading card with a glossy finish.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

noun

Meaning 11

A stylized flower or leaf.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: government, heraldry, hobbies, lifestyle, monarchy, nobility, politics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

Clipping of hydrofoil.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, clipping, countable, uncountable

Topics: geography, hydrodynamics, hydrology, natural-sciences, nautical, physical-sciences, physics, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

noun

Meaning 13

Clipping of aerofoil/airfoil.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, clipping, countable, uncountable

Topics: aerodynamics, aeronautics, aerospace, aviation, business, engineering, natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

14

noun

Meaning 14

Failure when on the point of attainment; defeat; frustration; miscarriage.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

15

noun

Meaning 15

One of the incorrect answers presented in a multiple-choice test.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

16

noun

Meaning 16

The track of an animal.

Definition source: English Wiktionary via Wiktextract

Topics: hobbies, hunting, lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

17

noun

Meaning 17

A small arc in the tracery of a window, etc.

Definition source: English Wiktionary via Wiktextract

Topics: architecture

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

18

verb

Meaning 18

To apply the FOIL algorithm to.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

19

verb

Meaning 19

To cover or wrap with foil.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

20

verb

Meaning 20

Clipping of hydrofoil.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, clipping

Topics: nautical, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

21

verb

Meaning 21

To prevent (something) from being accomplished.

Definition source: English Wiktionary via Wiktextract

Examples

  • They foiled my plans.

Meaning relationships

Synonyms: put the kibosh on, scupper, thwart

Antonyms: none provided

22

verb

Meaning 22

To prevent (someone) from accomplishing something.

Definition source: English Wiktionary via Wiktextract

Examples

  • I was foiled by my superior

Meaning relationships

Synonyms: none provided

Antonyms: none provided

23

verb

Meaning 23

To blunt; to dull; to spoil.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: mar, mess up, vitiate, ball up, blight, bumble, botch, bugger up, bungle, contaminate, corrupt, crab, deprave, disrupt, disturb, foil, fuck up, jack up, mishandle, mommick, pollute, put a crimp in, queer, ruin, screw up, soil, sour, spoil, stain, undo, upset, turn upside down, upset the applecart

Antonyms: none provided

24

verb

Meaning 24

To tread underfoot; to trample.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

25

verb

Meaning 25

To expand a product of two or more algebraic expressions, typically binomials.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

26

verb

Meaning 26

To defile; to soil.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: befile, stain, sully, assoil, beclart, bedaub, bedirty, imbrue (especially with blood), bedizen, befilth, befoul, begrime, beray, beshit, besmear, besmirch, besully, bewray, blacken, blot, blur, clat, contaminate, darken, defile, dirten, dirty, elt, file, foil, foul, gunk, gunk up, inquinate, scunge, sling mud, slotter, slur, smear, smirch, smudge, smut, smutch, soil, soss, sowl, spot, sullow, tarnish, uggle

Antonyms: none provided

27

noun

Meaning 27

a light slender flexible sword tipped by a button

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: fencing sword

28

noun

Meaning 28

a piece of thin and flexible sheet metal

Definition source: Princeton WordNet 3.0

Examples

  • the photographic film was wrapped in foil

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: sheet metal

Narrower terms: aluminum foil, aluminium foil, tin foil, chaff, gold foil, tinfoil

29

noun

Meaning 29

picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: transparency

Antonyms: none provided

Broader terms: picture, image, icon, ikon

Narrower terms: slide, lantern slide, viewgraph, overhead

30

noun

Meaning 30

a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through

Definition source: Princeton WordNet 3.0

Examples

  • the fins of a fish act as hydrofoils

Meaning relationships

Synonyms: hydrofoil

Antonyms: none provided

Broader terms: device

31

noun

Meaning 31

anything that serves by contrast to call attention to another thing's good qualities

Definition source: Princeton WordNet 3.0

Examples

  • pretty girls like plain friends as foils

Meaning relationships

Synonyms: enhancer

Antonyms: none provided

Broader terms: attention

32

verb

Meaning 32

cover or back with foil

Definition source: Princeton WordNet 3.0

Examples

  • foil mirrors

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: cover

33

verb

Meaning 33

hinder or prevent (the efforts, plans, or desires) of

Definition source: Princeton WordNet 3.0

Examples

  • What ultimately frustrated every challenger was Ruth's amazing September surge
  • foil your opponent

Meaning relationships

Synonyms: thwart, queer, spoil, scotch, cross, frustrate, baffle, bilk

Antonyms: none provided

Broader terms: prevent, forestall, foreclose, preclude, forbid

Narrower terms: disappoint, let down, dash, short-circuit, ruin

34

verb

Meaning 34

enhance by contrast

Definition source: Princeton WordNet 3.0

Examples

  • In this picture, the figures are foiled against the background

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: contrast, counterpoint

History

Etymology

Acronym of first outer inner last or similar.

From Middle English foyle, from Middle French fueille, from Old French fueille (“plant leaf”), from Late Latin folia, the plural of folium, mistaken as a singular feminine. The literary sense is from the practice of backing a gem with metal foil to make it shine more brilliantly. Doublet of folio and folium, distantly also with phyllo and phyllon.

From Middle English foilen (“spoil a scent trail by crossing it”), from Old French fouler (“tread on, trample”), ultimately from Latin fullō (“to trample, full”).

From French foulis.

From mnemonic acronym FOIL (“First Outside Inside Last”).

See file.

Across languages

Translations

161 source translations are retained for this English entry.

  • Armenian: նրբաթիթեղ (nrbatʻitʻeġ) — thin sheet of metal
  • Armenian: փայլաթիթեղ (pʻaylatʻitʻeġ) — thin sheet of metal
  • Armenian: ֆոլգա (folga) — thin sheet of metal
  • Assamese: ৰাংপতা (raṅpota) — thin sheet of metal
  • Belarusian: фо́льга (fólʹha) — thin sheet of metal
  • Bulgarian: фо́лио (fólio) — thin sheet of metal
  • Bulgarian: станио́л (staniól) — thin sheet of metal
  • Catalan: full — thin sheet of metal
  • Chinese Mandarin: 箔 (bó) — thin sheet of metal
  • Czech: fólie — thin sheet of metal
  • Danish: folie — thin sheet of metal
  • Dutch: folie — thin sheet of metal
  • Finnish: folio — thin sheet of metal
  • Finnish: ohkolevy — thin sheet of metal
  • French: feuille de métal — thin sheet of metal
  • Georgian: ფოლგა (polga) — thin sheet of metal
  • German: Folie — thin sheet of metal
  • Greek: έλασμα (élasma) — thin sheet of metal
  • Indonesian: kertas logam — thin sheet of metal
  • Italian: lamina — thin sheet of metal
  • Italian: lamella — thin sheet of metal
  • Japanese: ホイル (hoiru) — thin sheet of metal
  • Japanese: フォイル (foiru) — thin sheet of metal
  • Japanese: 金属裏張り (kinzoku urabari) — thin sheet of metal
  • Japanese: 箔 (haku) — thin sheet of metal
  • Korean: 포일 (poil) — thin sheet of metal
  • Latin: bractea — thin sheet of metal
  • Lithuanian: folija — thin sheet of metal
  • Māori: raukonu — thin sheet of metal
  • Middle English: foyle — thin sheet of metal
  • Norwegian Bokmål: folie — thin sheet of metal
  • Norwegian Nynorsk: folie — thin sheet of metal
  • Persian: فویل (fuyl) — thin sheet of metal
  • Polish: folia — thin sheet of metal
  • Portuguese: folha — thin sheet of metal
  • Romanian: foiță — thin sheet of metal
  • Russian: фольга́ (folʹgá) — thin sheet of metal
  • Russian: станио́ль (staniólʹ) — thin sheet of metal
  • Spanish: lámina de metal — thin sheet of metal
  • Spanish: folio — thin sheet of metal
  • Swedish: folie — thin sheet of metal
  • Turkish: folyo — thin sheet of metal
  • Ukrainian: фо́льга (fólʹha) — thin sheet of metal
  • Armenian: ֆոլգա (folga) — thin aluminium/aluminum or tin used for wrapping food
  • Bulgarian: вара́к (varák) — thin aluminium/aluminum or tin used for wrapping food
  • Bulgarian: станио́л (staniól) — thin aluminium/aluminum or tin used for wrapping food
  • Catalan: paper d'alumini — thin aluminium/aluminum or tin used for wrapping food
  • Danish: folie — thin aluminium/aluminum or tin used for wrapping food
  • Dutch: Aluminiumfolie — thin aluminium/aluminum or tin used for wrapping food
  • Finnish: folio — thin aluminium/aluminum or tin used for wrapping food
  • French: papier d'aluminium — thin aluminium/aluminum or tin used for wrapping food
  • French: alu — thin aluminium/aluminum or tin used for wrapping food
  • German: Aluminiumfolie — thin aluminium/aluminum or tin used for wrapping food
  • Greek: αλουμινόχαρτο (alouminócharto) — thin aluminium/aluminum or tin used for wrapping food
  • Indonesian: kerajang — thin aluminium/aluminum or tin used for wrapping food
  • Indonesian: kertas aluminium — thin aluminium/aluminum or tin used for wrapping food
  • Italian: carta stagnola — thin aluminium/aluminum or tin used for wrapping food
  • Kapampangan: palara — thin aluminium/aluminum or tin used for wrapping food
  • Lithuanian: folija — thin aluminium/aluminum or tin used for wrapping food
  • Malay: kerajang — thin aluminium/aluminum or tin used for wrapping food
  • Norwegian Bokmål: folie — thin aluminium/aluminum or tin used for wrapping food
  • Norwegian Nynorsk: folie — thin aluminium/aluminum or tin used for wrapping food
  • Polish: folia — thin aluminium/aluminum or tin used for wrapping food
  • Portuguese: papel-alumínio — thin aluminium/aluminum or tin used for wrapping food
  • Russian: фольга́ (folʹgá) — thin aluminium/aluminum or tin used for wrapping food
  • Spanish: papel de aluminio — thin aluminium/aluminum or tin used for wrapping food
  • Swedish: aluminiumfolie — thin aluminium/aluminum or tin used for wrapping food
  • Tagalog: palara — thin aluminium/aluminum or tin used for wrapping food
  • Bulgarian: рапи́ра (rapíra) — type of sword used in fencing
  • Catalan: floret — type of sword used in fencing
  • Chinese Mandarin: 花劍 /花剑 (huājiàn) — type of sword used in fencing
  • Czech: fleret — type of sword used in fencing
  • Danish: fleuret — type of sword used in fencing
  • Dutch: floret — type of sword used in fencing
  • Esperanto: skerma glavo — type of sword used in fencing
  • Finnish: floretti — type of sword used in fencing
  • French: fleuret — type of sword used in fencing
  • German: Florett — type of sword used in fencing
  • Greek: ελαφρύ ξίφος ξιφασκίας (elafrý xífos xifaskías) — type of sword used in fencing
  • Hungarian: tőr — type of sword used in fencing
  • Indonesian: floret — type of sword used in fencing
  • Indonesian: pedang anggar — type of sword used in fencing
  • Irish: pionsa maol — type of sword used in fencing
  • Italian: fioretto — type of sword used in fencing
  • Japanese: フルーレ (furūre) — type of sword used in fencing
  • Korean: 플뢰레 (peulloere) — type of sword used in fencing
  • Latin: rudis — type of sword used in fencing
  • Lithuanian: rapyra — type of sword used in fencing
  • Macedonian: флоре́т (florét) — type of sword used in fencing
  • Manx: cliwe crammanagh — type of sword used in fencing
  • Polish: floret — type of sword used in fencing
  • Portuguese: florete — type of sword used in fencing
  • Romanian: floretă — type of sword used in fencing
  • Russian: рапи́ра (rapíra) — type of sword used in fencing
  • Spanish: florete — type of sword used in fencing
  • Swedish: florett — type of sword used in fencing
  • Turkish: flöre — type of sword used in fencing
  • Welsh: ffwyl — type of sword used in fencing
  • Danish: folie — thin layer of metal put between a jewel and its setting to make it seem more brilliant
  • Finnish: folio — thin layer of metal put between a jewel and its setting to make it seem more brilliant
  • Hindi: डाक (ḍāk) — thin layer of metal put between a jewel and its setting to make it seem more brilliant
  • Indonesian: perada — thin layer of metal put between a jewel and its setting to make it seem more brilliant
  • Lithuanian: folija — thin layer of metal put between a jewel and its setting to make it seem more brilliant
  • Malay: perada — thin layer of metal put between a jewel and its setting to make it seem more brilliant
  • Catalan: comparsa — character who helps emphasise the traits of the main character
  • Dutch: contrastfiguur — character who helps emphasise the traits of the main character
  • French: faire-valoir — character who helps emphasise the traits of the main character
  • German: Kontrastfigur — character who helps emphasise the traits of the main character
  • Indonesian: tokoh kontras — character who helps emphasise the traits of the main character
  • Italian: spalla — character who helps emphasise the traits of the main character
  • Spanish: florete — character who helps emphasise the traits of the main character
  • Danish: baggrund — anything that acts to emphasise the characteristics of something
  • Spanish: complemento — anything that acts to emphasise the characteristics of something
  • Bulgarian: следа́ (sledá) — track of an animal
  • Bulgarian: диря́ (dirjá) — track of an animal
  • Danish: fært — track of an animal
  • Danish: spor — track of an animal
  • Bulgarian: опако́вам (opakóvam) — cover with foil
  • Bulgarian: обви́вам (obvívam) — cover with foil
  • Bulgarian: обви́я (obvíja) — cover with foil
  • Finnish: kelmuttaa — cover with foil
  • Arabic: فَشَّلَ (faššala) — prevent from being accomplished
  • Arabic: أحبط (ahbata) — prevent from being accomplished
  • Arabic: أفشل (afshala) — prevent from being accomplished
  • Armenian: խափանել (xapʻanel) — prevent from being accomplished
  • Armenian: առաջն առնել (aṙaǰn aṙnel) — prevent from being accomplished
  • Bulgarian: потъ́пквам (potǎ́pkvam) — prevent from being accomplished
  • Bulgarian: потъ́пча (potǎ́pča) — prevent from being accomplished
  • Chinese Mandarin: 阻止 (zǔzhǐ) — prevent from being accomplished
  • Danish: forhindre — prevent from being accomplished
  • Danish: forpurre — prevent from being accomplished
  • Dutch: verijdelen — prevent from being accomplished
  • Dutch: afweren — prevent from being accomplished
  • Dutch: frustreren — prevent from being accomplished
  • Dutch: verhinderen — prevent from being accomplished
  • Finnish: estää — prevent from being accomplished
  • Finnish: pilata suunnitelma — prevent from being accomplished
  • French: déjouer — prevent from being accomplished
  • French: contrecarrer — prevent from being accomplished
  • German: hintertreiben — prevent from being accomplished
  • Greek: ματαιώνω (mataióno) — prevent from being accomplished
  • Hebrew: מנע (maná) — prevent from being accomplished
  • Hungarian: meghiúsít — prevent from being accomplished
  • Indonesian: kerjang — prevent from being accomplished
  • Italian: sventare — prevent from being accomplished
  • Macedonian: спре́чи (spréči) — prevent from being accomplished
  • Māori: whakahēhē — prevent from being accomplished
  • Polish: udaremniać — prevent from being accomplished
  • Polish: udaremnić — prevent from being accomplished
  • Portuguese: frustrar — prevent from being accomplished
  • Russian: предотвраща́ть (predotvraščátʹ) — prevent from being accomplished
  • Russian: предотврати́ть (predotvratítʹ) — prevent from being accomplished
  • Spanish: frustrar — prevent from being accomplished
  • Spanish: abortar — prevent from being accomplished
  • Swedish: omintetgöra — prevent from being accomplished
  • Swedish: kullkasta — prevent from being accomplished
  • Thai: ทําลาย (tamlaai) — prevent from being accomplished
  • Bulgarian: разкри́вам ско́би (razkrívam skóbi) — to expand a product of two or more algebraic expressions, typically binomials
  • Bulgarian: разкри́я ско́би (razkríja skóbi) — to expand a product of two or more algebraic expressions, typically binomials
  • Dutch: uitwerken — to expand a product of two or more algebraic expressions, typically binomials
  • Finnish: kertoa auki — to expand a product of two or more algebraic expressions, typically binomials