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shut your gob
An imperative to be quiet or cease talking immediately. Can be rude, aggressive, or jocular depending on the context. Shut your gob, Bobby—no one asked for the opinion of a dork like you! A: "So, where do you think we can sell these stolen goods?" B: "Shut your gob! Don't you have enough sense not to talk about that in public?" A: "Wow, that Cadillac has seen better days. How much did you pay for that little gem?" B: "Ah, shut your gob, Dave. I think it looks just fine."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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’.
Farlex Partner Idioms Dictionary © Farlex 2017
1. n. a blob or mass of something. Take that horrid gob of gum out of your mouth!
2. n. a large amount of something. (Often in the plural.) I need gobs of money to get through school.
3. n. the mouth. (Chiefly British.) Pop that in your gob and see if you like it!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.