鼓足干劲／勇气
to prepare to make a great effort to be strong or brave
I spent a week gathering the courage to say no. 我憋了一星期，终于鼓足勇气说不。
She paused briefly to gather her strength.
Somehow I managed to gather up the courage to ask her out.
I'm just gathering strength for another round of treatment.
She took a few deep breaths to gather courage and then walked in the room.
He lay on the sofa, gathering up his strength to leave the house.
See also: gather verb (COLLECT)