Definition
to cultivate or arouse a strong emotional or physical state after a period of effort or duration
培养；激发
She worked up her confidence before the speech.
她在演讲前培养了自己的信心。
He worked up his competitive spirit for the upcoming match.
他为即将到来的比赛激发了竞争精神。
After an hour of practice, he worked up a passion for the piece.
经过一个小时的练习，他对这首曲子产生了热情。