get/work up the nerve 鼓起勇气

nerve 神经，勇气，胆量

Mike is trying to get up the nerve to ask for a 50% raise.

麦克打算鼓起勇气起找老板加薪50%。

I'm trying to work up the nerve to ask her to marry me.

我一直想鼓起勇气开口向她求婚。