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smarten /ˈsmɑɚtn̩/  

  • verb
    -ens; -ened; -ening
    smarten up
    [phrasal verb]
    US
    to become more intelligent or aware :to become smarter
    He told me to smarten up and pay attention to the teacher.
    He'd better smarten up [=wise upor he'll get fired.
    b smarten (someone or something) up or smarten up (someone or something) :to make (someone or something) smarter or more aware
    Someone needs to smarten him up before he gets in trouble.
    smarten (someone or something) up or smarten up (someone or something) :to make (someone or something) neat and attractive