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

 

smarten up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    smarten somebody/somethingup

    |

    smarten (yourself) up

     
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  1. 1to 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.
  2. 2 to make yourself, another person, or their behavior become smarter or more sensible You're 21, it's time you smartened up. He needs to smarten up his spending habits.
See the Oxford Advanced Learner's Dictionary entry: smarten up