Definition
To refrain from speaking; to keep silent.
關閉嘴巴（別說話）
You had better hold your tongue when the boss is around.
當老闆在場時，你最好保持沉默。
She desperately wanted to argue back, but she chose to hold her tongue.
她非常想反駁，但選擇了保持沉默。
During the meeting, I had to remind myself to hold my tongue and not interrupt.
在會議期間，我不得不提醒自己保持沉默，不要打斷。