Let-the-cat-out-of-the-bag meaning

(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.

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Origin of let-the-cat-out-of-the-bag

  • (Mid-1700s) The inverse of the idiom pig in a poke. If a dishonest merchant tries to sell a cat as a pig and the cat comes out or is taken out of the bag, the merchant's secret is disclosed.

    From Wiktionary