not open (one's) mouth

(redirected from doesn'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 ?
Still, says one White House official of Cartwright, "He doesn't open his mouth without saying something impressive.
That doesn't mean to say he doesn't open his mouth.
I wouldn't argue that he is infallible in everything he says, but unlike so many of us he doesn't open his mouth just for the pleasure of hearing himself speak.
A nonentity following a grown man about to make sure he doesn't open his mouth.
There are obviously going to be feuds that build up from certain fouls and tackles - but he's got to be careful he doesn't open his mouth and start showing dissent.