let one go

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let one go (third-person singular simple present lets one go, present participle letting one go, simple past and past participle let one go)

1. (slang, idiomatic) To fart.
   • 2012, Dougie Brimson, Art of Fart, →ISBN:

     I certainly can't recall him letting one go and not apportioning blame to me or one of my brothers […]

• “let one go”, in OneLook Dictionary Search.