pluck up your courage idiom (also pluck up (the) courage to do something)
C2 鼓起勇气
to force yourself to be brave enough to do something, although you are frightened or worried about it
He finally plucked up courage to ask her to marry him. 他最终鼓起勇气向她求婚。
I'd love to do a parachute jump, but I can't pluck up the/enough courage. 我很想跳伞，但没那份胆量。