pump up 打气

pump up有这两个意思：

①字面意思：给(轮胎等)打气

Pump all the tyres up.

给所有的轮胎打气。

②比喻意义：为打气，使鼓起勇气

He was offering them advice and trying to pump them up.

他给他们提建议，努力给他们打气。