to make someone look or feel young and energetic again

She felt rejuvenated by her fortnight in the Bahamas. 在巴哈马群岛度了两周假，她觉得自己变年轻了。

to make an organization or system more effective by introducing new methods, ideas, or people

He has decided to rejuvenate the team by bringing in a lot of new, young players. 他决定大批引进年轻的新队员，使球队恢复活力。