Standard Lemma guide

eff

name · noun · verb · 7 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.

  • ĕf
  • /ɛf/
  • rhymes with -ɛf
  • homophone: ef

1

name

Meaning 1

Initialism of Electronic Frontier Foundation.

Definition source: English Wiktionary via Wiktextract

Usage: Internet, abbreviation, alt-of, initialism

Topics: business, electrical-engineering, electricity, electromagnetism, electronics, energy, engineering, government, natural-sciences, physical-sciences, physics, politics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

name

Meaning 2

Initialism of Economic Freedom Fighters.

Definition source: English Wiktionary via Wiktextract

Usage: South-Africa, abbreviation, alt-of, initialism

Topics: government, politics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

Alternative spelling of ef; the name of the Latin script letter F/f.

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, alternative

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

Alternative letter-case form of eff.

Definition source: English Wiktionary via Wiktextract

Usage: alt-of

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

verb

Meaning 5

Synonym of fuck.

Definition source: English Wiktionary via Wiktextract

Usage: euphemistic, slang

Examples

  • Eff off!
  • And he kept saying, "Effing this, effing that."

Meaning relationships

Synonyms: feck, frak, frig, fork, funk, fuck

Antonyms: none provided

6

verb

Meaning 6

To put into words; to express.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

verb

Meaning 7

have sexual intercourse with

Definition source: Princeton WordNet 3.0

Examples

  • This student sleeps with everyone in her dorm
  • Adam knew Eve
  • Were you ever intimate with this man?

Meaning relationships

Synonyms: sleep together, roll in the hay, love, make out, make love, sleep with, get laid, have sex, know, do it, be intimate, have intercourse, have it away, have it off, screw, fuck, jazz, hump, lie with, bed, have a go at it, bang, get it on, bonk

Antonyms: none provided

Broader terms: copulate, mate, pair, couple

Narrower terms: take, have, fornicate

History

Etymology

From the name of the letter f (see etymology 1), the initial letter of fuck. Compare pee.

Back-formation from ineffable, ultimately from Latin effor (“utter”).