Wait up 等候着不睡
She told her parents not to wait up for her. She might stay with her aunt.
告诉她爸妈，不要等着她不睡了，她可能在她姨家过夜。
Hadn't we better wait up for the slower ones?
我们是不是等一下后面的人？

flip out 精神失常; 发疯
He was out of his mind with grief.
他伤心得精神错乱了。
She rushed madly out of the room.
她发疯似地冲出房间。

figure out 合计,领会到
The boy can't figure out the algebra problems.
这个男孩做不出这道代数题。
It didn't take the children long to figure out the correct answer.
孩子们没有花很多时间就算出了正确的答案。