done for idiom
即将送命;即将受难
to be about to die or suffer very much because of a serious difficulty or danger
We all thought we were done for when the boat started to sink. 船开始下沉时我们都觉得这下要完了。
informal非常疲劳的
very tired
I'm really done for - I'm going to bed. 我真累坏了——我要去睡觉了。