n. & v.
--n.
1. music of US Negro origin characterized by improvisation, syncopation, and usu. a regular or forceful rhythm.
2 sl. pretentious talk or behaviour, nonsensical stuff (all that jazz).
--v.intr. play or dance to jazz.
Phrases and idioms:
jazz up brighten or enliven.
Derivatives:
jazzer n.
Etymology: 20th c.: orig. uncert.