Definition
To refrain from speaking; to keep silent.
闭嘴巴（别说话）
You had better hold your tongue when the boss is around.
当老板在场时，你最好保持沉默。
She desperately wanted to argue back, but she chose to hold her tongue.
她非常想反驳，但选择了保持沉默。
During the meeting, I had to remind myself to hold my tongue and not interrupt.
在会议期间，我不得不提醒自己保持沉默，不要打断。