English version

let the cat out of the bag

From Longman Dictionary of Contemporary Englishlet the cat out of the baglet the cat out of the bagTELL A SECRETto tell someone a secret, especially without intending to cat
Examples from the Corpus
let the cat out of the bagI'm sorry. Jim knows about last week's party. I'm afraid I let the cat out of the bag.Inadvertently perhaps, the BiE report lets the cat out of the bag.Some idiot's let the cat out of the bag -- Mrs Simpson realizes there's something going on.
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