From Longman Dictionary of Contemporary Englishsmartensmart‧en /ˈsmɑːtn $ ˈsmɑːr-/ verb → smarten something ↔ up→ See Verb table
Examples from the Corpus
smarten• It's been compared with New York's notorious Bronx, but now the council plans to smarten it up.• On the other hand, more than a few civilians were sloppy and needed to smarten up a bit.• Rain wished he had some one to make sure he spent part of the proceeds on smartening up his flat.• The exterior of the whole building itself is also about to receive new cladding which will smarten up its slightly dilapidated appearance.• In the 1970s money just was not available to smarten up more than a handful of Provincial stations.• Despite the encouraging figures, the Chunnel has prompted ferry companies to smarten up their act, and offer better deals.• No attempts made to knuckle down and smarten up. 