not open one's mouth
и рта не раскрыть, ничего не сказать
Robert was depressed; he did not open his mouth all day.
- laugh out of the other side of one's mouth
- bad-mouth (someone or something)
- by word of mouth
- put words into (someone's) mouth
- run off at the mouth
- take the words out of (someone's) mouth
- foam at the mouth
- have a big mouth
- shoot one's mouth off
- leave a bad taste in one's mouth
- down in the mouth
- keep one's mouth shut
- Shut your mouth!