Definition
To use a toilet or restroom.
上廁所
I need to go to the bathroom; I'll be right back.
我需要去洗手間；我馬上回來。
Before the movie starts, we should go to the bathroom first.
在電影開始之前，我們應該先去洗手間。
He excused himself from the meeting, saying he needed to go to the bathroom.
他從會議中告退，說他需要去洗手間。