Standard Lemma guide

backslash

noun · verb · 3 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.

  • /ˈbækˌslæʃ/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -æʃ
  • CMU ARPABET: B AE1 K S L AE2 SH Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

The punctuation mark \ (a left-leaning diagonal line). (Common uses include (1) use as a delimiter in filepaths and (2) use as an escape character to mark literals.)

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: backward slash, reverse solidus, slosh, whack

Antonyms: none provided

2

noun

Meaning 2

The punctuation mark /; a slash, forward slash.

Definition source: English Wiktionary via Wiktextract

Usage: proscribed, rare

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

verb

Meaning 3

To escape (a metacharacter) by prepending a backslash that serves as an escape character, thereby forming an escape sequence.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From back + slash, because it is a slash “leaning back” against the direction of writing (in writing lines from left to right), in contrast to the more common (forward) slash / (“solidus, oblique, diagonal”). The actual direction of (hand-)writing these marks can be reversed, when writing from left to right, top to baseline: the backslash forwards, the (forward) slash backwards. The naming can be explained as an anthropomorphism, assuming a bar (|) standing on the baseline, facing in the direction of writing, toppling backwards or forwards, respectively. The (new) Unicode name of \ is REVERSE SOLIDUS.

Across languages

Translations

58 source translations are retained for this English entry.

  • Arabic: مَائِلَة مُعَاكِسَة (māʔila muʕākisa) — punctuation mark
  • Bulgarian: обра́тна черта́ (obrátna čertá) — punctuation mark
  • Chinese Mandarin: 反斜線 /反斜线 (fǎnxiéxiàn) — punctuation mark
  • Chinese Mandarin: 反斜槓 /反斜杠 (fǎnxiégàng) — punctuation mark
  • Czech: zpětné lomítko — punctuation mark
  • Dutch: backslash — punctuation mark
  • Dutch: terugschrap — punctuation mark
  • Dutch: omgekeerde schuine streep — punctuation mark
  • Dutch: schuine streep naar links — punctuation mark
  • Dutch: schuine streep naar achter — punctuation mark
  • Dutch: terugstreep — punctuation mark
  • Esperanto: deklivo — punctuation mark
  • Estonian: kurakaldkriips — punctuation mark
  • Estonian: längkriips — punctuation mark
  • Estonian: kurakriips — punctuation mark
  • Faroese: bakskák — punctuation mark
  • Finnish: kenoviiva — punctuation mark
  • French: barre oblique inversée — punctuation mark
  • French: contre-oblique — punctuation mark
  • French: backslash — punctuation mark
  • French: antislash — punctuation mark
  • German: Backslash — punctuation mark
  • German: Rückwärtsschrägstrich — punctuation mark
  • Greek: αντιπλάγια (antiplágia) — punctuation mark
  • Greek: ανάστροφη κάθετος (anástrofi káthetos) — punctuation mark
  • Hungarian: fordított törtvonal — punctuation mark
  • Italian: barra inversa — punctuation mark
  • Japanese: バックスラッシュ (bakkusurasshu) — punctuation mark
  • Japanese: 逆斜線 (gyakushasen) — punctuation mark
  • Korean: 역슬래시 (yeokseullaesi) — punctuation mark
  • Korean: 역사선 (yeoksaseon) — punctuation mark
  • Macedonian: лева коса црта (leva kosa crta) — punctuation mark
  • Maltese: sinjal djagonali — punctuation mark
  • Norwegian Bokmål: bakstrek — punctuation mark
  • Polish: ukośnik odwrotny — punctuation mark
  • Polish: ukośnik wsteczny — punctuation mark
  • Polish: ukośnik lewy — punctuation mark
  • Portuguese: barra invertida — punctuation mark
  • Portuguese: barra inversa — punctuation mark
  • Portuguese: contrabarra — punctuation mark
  • Romanian: bară oblică inversă — punctuation mark
  • Romanian: linie oblică inversă — punctuation mark
  • Russian: обра́тная коса́я (obrátnaja kosája) — punctuation mark
  • Russian: обра́тная коса́я черта́ (obrátnaja kosája čertá) — punctuation mark
  • Russian: обра́тный слэш (obrátnyj slɛš) — punctuation mark
  • Russian: бе́кслэ́ш (békslɛ́š) — punctuation mark
  • Slovak: spätná lomka — punctuation mark
  • Slovak: opačná lomka — punctuation mark
  • Slovene: leva poševnica — punctuation mark
  • Spanish: barra inversa — punctuation mark
  • Spanish: barra oblicua inversa — punctuation mark
  • Spanish: barra invertida — punctuation mark
  • Spanish: barra revertida — punctuation mark
  • Spanish: contrabarra — punctuation mark
  • Thai: แบ็กสแลช — punctuation mark
  • Turkish: ters bölü — punctuation mark
  • Ukrainian: обе́рнена скісна́ ри́ска (obérnena skisná rýska) — punctuation mark
  • Ukrainian: бе́кслеш (béksleš) — punctuation mark