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English definition of “let the cat out of the bag”

let the cat out of the bag

to allow a secret to be known, usually without intending to: I was trying to keep the party a secret, but Mel went and let the cat out of the bag.
(Definition of let the cat out of the bag from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “let the cat out of the bag”

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