au cas où

French, conjunction/o ka u/

au cas où is a French conjunction meaning “in case (+ conditional or subjunctive)” (English Wiktionary, September 2026). The French Wiktionary (Wiktionnaire) defines it as “Dans l’éventualité où ; à supposer que”.

What does au cas où mean in English?

conjunction

1
in case (+ conditional or subjunctive)
Prends un imperméable, au cas où il pleuvrait.

adverb

1
just in case
Prends un imperméable, au cas où.

Source: English Wiktionary, French section, dump of September 2, 2026 (CC BY-SA 4.0).

How French dictionaries define it

conjunction: 1. Dans l’éventualité où ; à supposer que.

adverb: 1. Dans le cas supposé.

The definition in the French Wiktionary (Wiktionnaire), in French.

Source: French Wiktionary (Wiktionnaire), dump of September 1, 2026 (CC BY-SA 4.0), through kaikki.org.

How do you pronounce au cas où?

/o ka u/
/o kɑ u/
/o ka.z‿u/

Sources: English Wiktionary, French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026); recordings from Wikimedia Commons.

English words that translate to au cas où

in case

Source: the translation tables of the English Wiktionary, dump of September 2, 2026.