not open (one's) mouth
To be completely silent; to remain discreet (about something); to not tell anyone (about something). All the while our teacher was shouting at us, we didn't open our mouths. Don't open your mouth about this! I would die of embarrassment if anyone were to find out.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
not open one's mouth
and not utter a wordFig. not to say anything at all; not to tell something (to anyone). Don't worry, I'll keep your secret. I won't even open my mouth. Have no fear. I won't utter a word.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
not open one's mouth
Also,
shut one's mouth;
not say or utter a word . Be silent, repress one's feelings or opinions, keep a secret. For example,
Don't worry, I'm not going to open my mouth on this issue, or
She promised not to say a word about it to anyone. Also see
hold one's tongue;
keep one's mouth shut.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
open your (big) ˈmouth
(informal) say something when you should not: Why do you always have to open your big mouth? Can’t you just keep quiet sometimes?Farlex Partner Idioms Dictionary © Farlex 2017