Letting the cat out of the bag
English idiom
Letting the cat out of the bag
Letting the cat out of the bag (also ...box) is a colloquialism that means to reveal facts previously hidden. It could refer to revealing a conspiracy (friendly or not) to its target, letting an outsider into an inner circle of knowledge (e.g., explaining an in-joke), or the revelation of a plot twist in a movie or play. It also means to reveal a secret carelessly or by mistake.
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