blow the gaff

English

Verb

blow the gaff (third-person singular simple present blows the gaff, present participle blowing the gaff, simple past blew the gaff, past participle blown the gaff)

  1. (UK, slang, obsolete) To disclose a secret.
    Synonym: let the cat out of the bag
  2. (UK, slang, obsolete) To inform against a person.

References
  • John Camden Hotten (1873) The Slang Dictionary
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