let the cat out of the bag
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let the cat out of the bag (third-person singular simple present lets the cat out of the bag, present participle letting the cat out of the bag, simple past and past participle let the cat out of the bag)
- (idiomatic) To disclose a secret; to let a secret be known, often inadvertently.
- It was going to be a surprise party until someone let the cat out of the bag.
- 1849, Charlotte Brontë, Shirley
- He proved himself as decent, decorous, and conscientious as Peter was rampant, boisterous, and — This last epithet I choose to suppress, because it would let the cat out of the bag.
to disclose a secret, often inadvertently