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Meaning of blow the gaff | Babel Free

Verb CEFR C1

Definitions

To disclose a secret.
UK, obsolete, slang
To inform against a person.
UK, obsolete, slang

CEFR level

C1

Advanced
This word is part of the CEFR C1 vocabulary — advanced level.

See also

blow the grampus blow the lid off blow the roof off blow the whistle blow this pop stand blow this popsicle stand