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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.