From Longman Dictionary of Contemporary Englishjazz something ↔ up phrasal verbinformalINTERESTING to make something more attractive or exciting Jazz up your everyday meals with our new range of seasonings. → jazz→ See Verb table
Examples from the Corpus
jazz up• And on Fridays, live jazz spices things up.• I usually play with my own phrasing and kind of jazz it up a little.• You might be surprised to hear that you can jazz it up even more. 