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)
- (Britain, slang, obsolete) To disclose a secret.
- Synonym: let the cat out of the bag
- (Britain, slang, obsolete) To inform against a person.
References
- 1873, John Camden Hotten, The Slang Dictionary