shut your trap1 (also shut your gob!/shut it! British EnglishBrE) spoken not politeTALK TO somebody used to tell someone to stop talking 闭嘴! 住嘴! → shut your mouth/face/trap! at shut1(1)
2 spokenQUIET a rude way of telling someone to stop talking 闭上你的嘴! → shut your trap! at trap1(3)