Let the cat out of the bag

verb

Definitions

Verb
  1. 1
    To disclose a secret; to let a secret be known, often inadvertently. idiomatic

    "It was going to be a surprise party until someone let the cat out of the bag."

  2. 2
    divulge confidential information or secrets wordnet

Etymology

(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.

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