American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Keep your trap closed


Be quiet. Do not speak of a sensitive or secret subject. ‘Trap’ is a derogatory reference to your mouth which in this usage is like a trap door to idiocy. (Compare to Keep your mouth shut or Shut  up.)

“My grandma has a birthmark on her face, don’t refer to it, just keep your trap shut.”

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