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1. To become happier or experience improvement in one's mood, especially when sad or discouraged. Typically used as an imperative. Come on, the project was not a total failure—cheer up! Cheer up, honey—tomorrow's another day. I hope Jenny cheers up. I've never seen her so down.
2. To cause one to become happier or experience improvement in one's mood, especially when sad or discouraged. In this usage, a noun or pronoun can be used between "cheer" and "up." I don't know how to cheer Paul up—he's been completely miserable since he found out he didn't get that job. Grandpa could always cheer up Sarah when she was sad about something.
cheer someone up
to make a sad person happy. When Bill was sick, Ann tried to cheer him up by reading to him. Interest rates went up, and that cheered up all the bankers.
[for a sad person] to become happy. After a while, she began to cheer up and smile more. Cheer up! Things could be worse.
Become or make happy, raise the spirits of, as in This fine weather should cheer you up. This term may also be used as an imperative, as Shakespeare did ( 2 Henry IV, 4:4): "My sovereign lord, cheer up yourself." [Late 1500s]
1. To become happier or more cheerful: I cheered up once the weather got warmer.
2. To make someone happier or more cheerful: The fine spring day cheered me up. The hospital staged a musical to cheer up the sick patients.