Meaning of “smarten (sb/sth) up” in the English Dictionary

"smarten (sb/sth) up" in British English

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smarten (sb/sth) up

mainly UK
phrasal verb with smarten uk /ˈsmɑː.tən/ us /ˈsmɑːr.tən/ verb

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

"smarten (sb/sth) up" in Business English

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smarten (sb/sth) up

UK informal
phrasal verb with smarten uk /ˈsmɑːtən/ us verb

to improve your personal appearance or the appearance of something:

You'll need to buy a suit and smarten up a bit for the interview.
Staff were told to smarten themselves up for the inspection visit.
They've smartened up the design of their webpage.

also smarten up your act to begin working more effectively:

Poor performers need to smarten up quickly if they want to keep their jobs.
The industry needs to smarten up its act in relation to advertising and promotion.

(Definition of “smarten (sb/sth) up” from the Cambridge Business English Dictionary © Cambridge University Press)