To " cheer someone up, " or to " cheer up someone, " means to make someone feel better, to make someone feel happier – to do something that will make them feel happier.

“Cheer someone up” 或“Cheer up someone”的意思是让某人感觉更好，让某人感觉更快乐——做一些让他们感觉更快乐的事情。