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