not open one's mouth

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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.
See also: mouth, not, open
References in periodicals archive ?
There is an old proverb which states "it is better to remain silent and be thought a fool than to open one's mouth and remove all doubt.
Tis better to remain silent and be thought a fool, than to open one's mouth and remove all doubt' said Samuel Johnson.
Apparently they well understood the saying that it is better to keep silent and be thought stupid than to open one's mouth and remove all doubt.