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Cat out of the bag

Don't let the cat out of the bag.

What do you mean?
To let the cat out of the bag means to give away a secret, usually without meaning to, or against someone else's wishes.

Why does it mean this?
This saying comes from a trick played by traders at country fairs. Pig traders sometimes tried to fool customers by giving them a sack, into which they had secretly put a cat, which was worth less money than a pig. If the cat got out, the trick was discovered.

Example:It was meant to be a surprise party but Harry let the cat out of the bag by asking what time it started.
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