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

 

liven up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

liven up

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liven somebody/something up

 
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to become or to make someone or something more interesting or exciting The game didn't liven up till the second half. Let's put some music on to liven things up. You look as if you need livening up!
See the Oxford Advanced Learner's Dictionary entry: liven up