ulepšati

1. to beautify; to make prettier
   Cveće je baš ulepšalo naš stan. — The flowers really brightened up our flat.
   Ulepšala se za večerašnju proslavu. — She got dolled up for tonight's party.
2. (of a day, life) to brighten; to make more pleasant
   Hvala ti, ulepšao si mi dan! — Thanks, you made my day!
3. (of a story, the truth) to embellish; to sugarcoat
   Malo je ulepšao priču da bi zvučala zanimljivije. — He embellished the story a bit to make it sound more interesting.

With se it means to dress up or get prettier: ulepšati se za izlazak.