Meaning of “let the cat out of the bag” in the English Dictionary

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"let the cat out of the bag" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)