From Longman Dictionary of Contemporary Englishsmarten something ↔ up phrasal verb especially British English1SMART/WELL-DRESSED smarten yourself up to make yourself look neat and tidyYou’d better smarten yourself up.2TIDYto make something look neaterWe need to smarten the place up a bit.3smarten up your act/ideas to improve the way you behave or do somethingThe company needs to smarten up their act if they are to keep customers. →smarten→ See Verb table
Examples from the Corpus
smarten up• Andrew Lloyd-Webber's new wife, horsewoman Madeline Gurdon, has tried to smarten him up.• It's been compared with New York's notorious Bronx, but now the council plans to smarten it up.smarten yourself up• Jeremy, go smarten yourself up before dinner.• She's smartening herself up in the ladies' room.• Smarten up! It's time for inspection.smarten up your act/ideas• Despite the encouragingfigures, the Chunnel has promptedferry companies to smarten up their act, and offer better deals.