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

 

perk up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

perk up

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perk somebodyup

(informal)
 
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to become or to make someone become more cheerful or lively, especially after they have been sick or sad synonym brighten He soon perked up when his friends arrived.

perk up

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perk somethingup

(informal)
 
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to increase, or to make something increase in value, etc. Share prices had perked up slightly by close of trading.

perk somethingup

(informal)
 
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to make something more interesting, more attractive, etc. synonym liven ideas for perking up bland food Stencilling is a cheap and easy way to perk up old furniture.
See the Oxford Advanced Learner's Dictionary entry: perk up