Meaning of “smarten up your act” in the English Dictionary

british dictionary

"smarten up your act" in British English

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smarten up your act

mainly UK

to make more effort:

Why are you always so late? You'll have to smarten up your act if you want to keep your job.

(Definition of “smarten up your act” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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