liven(sb)up
—phrasal verbwithlivenverbuk/ˈlaɪ.vən/us/ˈlaɪ.vən/
tobecomemoreenergeticor in abettermood, or to make someonefeelthis way
（使）（某人）振作起来；（使）（某人）快乐起来
She wassubduedtostartwith, but after a while she livened up.刚开始的时候她有点儿沉默，但过了一阵就活跃起来了。
I'm going to liven myselfup a little by going for arun.我要去跑跑步换换心情。