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allez savoir

who knows

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phrase Rare #34,938
who knows An idiomatic expression used to express uncertainty, often with a slightly dismissive or resigned tone. Literally, it means “go and find out,” but it is not normally used as a literal command in these examples.
FR: Allez savoir où il est passé.
EN: Who knows where he went.

Allez savoir ce qui lui passe par la tête.

Who knows what's going through his head?

— Les Quatre Cents Coups (1959)

Allez savoir pourquoi.

Who knows why.

Allez savoir.

Who knows.

Allez savoir ce que ça veut dire.

Who knows what that means?