She was trying to summon up the courage to leave him.

当时她试图鼓起勇气离开他。

《牛津词典》

Somehow he could never summon up the courage to ask for her hand.

不知怎的，他总是鼓不起勇气向她求婚。

youdao

Somehow he could never summon up the courage to propose to her...

不知怎么，他就是提不起勇起向他求婚。

youdao

It was weeks before her death that Amy did summon up the courage to ask her family for help and begin the process of removing Morrison from her life.

BBC: How 'kind' boyfriend became violent bully

The handful of folks who were able to summon up the courage to enter the water were huddled into small groups a few feet offshore and periodically groups of teenage girls would shriek and run from the surf, inciting a mad scramble for the shore by the remaining bathers.

FORBES: You're Gonna Need A Bigger Boat