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.

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disgruntle
to deprive of ability, qualification, or strength
to put into a state of sulky dissatisfaction
to make repayment or return for (service, benefits, etc.)
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Words nearby not open one's mouth

Notogaean, not one iota, not one's day, this is, not oneself, not on your life, not open one's mouth, notoriety, notorious, notornis, nototherium, notoungulate
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.