American English

Definition of cheer up phrasal verb from the Oxford Advanced American Dictionary

 

cheer up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

cheer up

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cheer somebody/somethingup

 
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to become more cheerful; to make someone or something more cheerful Oh, come on—cheer up! Give Mary a call; she needs some cheering up. Bright curtains can cheer up a dull room.
See the Oxford Advanced Learner's Dictionary entry: cheer up