Pronunciation: /ˈsmɑːt(ə)n/
verb
(
smarten up or
smarten someone/thing up)
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1make or become smarter in appearance: [with object]: he spent part of the proceeds on smartening up his flat [no object]: if there was water to spare I would smarten up and shave
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2 [no object] behave more wisely: if you don’t smarten up soon, you’ll find yourself out on the street