Wash your face and open your mouth.

洗洗你的脸，张开你的嘴。

youdao

"Well," the Assassins asked, "will you open your mouth now or not?"

“好呀，”刺客们盘问，“你到底开不开口？”

youdao

Just open your mouth and speak!

只要张开嘴说！

youdao

You have to stop eating with your mouth open.

你不能再边说话边吃饭了。

have to 实战 - SpeakingMax英语口语达人

As I always say to my mentees: Talk, ask questions, poke, prod, open your mouth.

WHITEHOUSE: Mother��s Day at the White House

Do what your mother said: Stop and think before you open your mouth.

WSJ: What Makes People Overshare?

If not, open your mouth only to say something kind or grateful or to shove another helping of lox into it.

FORBES: How to Have a Carnage-Free Mother's Day