jazz up . jazz up {v.}, {slang} To brighten up; add more noise, movement, or color; make more lively or exciting. The party was very dull until Pete jazzed it up with his drums. Categories: add yours {slang} {v.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: J Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss