smarten (someone/something) up
phrasal verb with smarten verb uk/ˈsmɑː.tən/ us/ˈsmɑːr.tən/
mainly UK
（使）变得整洁入时，（使）变得时髦
to (cause to) become more clean, tidy, and stylish
She's really smartened herself up since she finished college. 她大学毕业后确实更会打扮了。
You'll have to smarten up if you want to work in television. 如果你想在电视行业工作，就必须将自己打扮得漂漂亮亮的。