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blow the gaff

Slang definitions & phrases for blow the gaff

blow the gaff

verb phrase

To inform on someone; sing: didn't mind if I blew the gaff on this ''common practice''

[Underworld 1800s+; to reveal the concealed cheating mechanism of a carnival game]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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