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

 

smarten up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

smarten up somebody

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smarten up something

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smarten somebody up

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smarten something up

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smarten (yourself) up

 
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(especially British English) to make yourself, another person or a place look neater or more attractive The hotel has been smartened up by the new owners. You’d better smarten yourself up before you go out. It’s time you smartened up.
See the Oxford Advanced American Dictionary entry: smarten up