Definition of perk up phrasal verb from the Oxford Advanced Learner's Dictionary

Phrasal Verbs

perk up

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perk somebodyup

 
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(informal) to become or to make somebody become more cheerful or lively, especially after they have been ill/sick or sad synonym brighten He soon perked up when his friends arrived. See related entries: Energetic, Recovering from illness

perk up

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perk somethingup

 
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(informal) to increase, or to make something increase in value, etc. Share prices had perked up slightly by close of trading.
(informal) to make something more interesting, more attractive, etc. synonym liven up ideas for perking up bland food Stencilling is a cheap and easy way to perk up old furniture.
See the Oxford Advanced American Dictionary entry: perk up