Longman Dictionary of Contemporary English homepage

smarten

 verb
     
smart‧en

smarten something ↔ up

phrasal verb
1

smarten yourself up

to make yourself look neat and tidy:
You'd better smarten yourself up.
2 to make something look neater:
We need to smarten the place up a bit.
3

smarten up your act/ideas

to improve the way you behave or do something:
The company needs to smarten up their act if they are to keep customers.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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