Definition of blow the gaff
British slang
: to reveal a secret especially in a public way
—usually + on The report blows the gaff on a series of illegal actions by the government.
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“Blow the gaff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blow%20the%20gaff. Accessed 25 Jun. 2021.
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