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
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/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.
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