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

 

buff up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

buff up

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buff yourself up

(slang)
 
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to make yourself more attractive, especially by exercising in order to make your muscles bigger He buffed up to take the role of the commando captain.

buff somebody/something up

(informal)
 
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to work on someone or something to make them/it seem more attractive or impressive The team will have to buff up their tarnished image. The city spent $40 million buffing up the downtown area before the festival.
See the Oxford Advanced Learner's Dictionary entry: buff up