not open (one's) mouth

(redirected from didn't open his mouth)

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.
See also: mouth, not, open

not open one's mouth

 and not utter a word
Fig. 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.
See also: mouth, not, open

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

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?
See also: mouth, open
References in periodicals archive ?
And when push got to shove, even Gordon McDougall, the Livingston chairman who said Regan had spoken to the clubs like children when he was campaigning for change, didn't open his mouth on decision day.
When he was left out he didn't open his mouth or anything, he just went back to the drawing board at Sussex and has done a fantastic job there.
The Labour Party did their best to make sure he didn't open his mouth during the campaign for fear he would lose them votes.
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