Dictionary
Words, grammatical forms and meanings linked to the ontology.
blow the gaff en · VERB
Meanings
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(UK, obsolete, slang) To disclose a secret.
But, my child, if Geoffrey is to be got out at this immature stage it blows the gaff completely. Half of the crowd will vanish, including all the worst, and we shall have no proof at all of the real depths of the conspiracy.
1934, Ernest Bramah, The Bravo of London:
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(UK, obsolete, slang) To inform against a person.
Forms
Synonyms
let the cat out of the bag