Shut your trap!
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shut your ˈmouth/ˈtrap/ˈface/ˈgob!(also keep your ˈmouth/ˈtrap shut) (slang) a rude way of telling somebody to be quiet or stop talking: ‘Shut your face’, Roger said, ‘or I’ll kick you out.’ ♢ Why can’t you learn to keep your big mouth shut?
Trap and gob are slang words for ‘mouth’.
Shut your trap!verb
See Shut your face!
See also: shut