PHRASAL VERB-ERG (使)高兴起来;(使)振作起来 When you cheer up or when something cheers you up, you stop feeling depressed and become more cheerful. (使)高兴起来;(使)振作起来 [Also VERBPREPOSITION n]
I think he misses her terribly. You might cheer him up. [VERB noun PREP.]
我估计他是太想念她了。也许你可以让他打起点儿精神来。
I wrote that song just to cheer myself up. [VERB pronoun-reflexive PREP.]