riff 1
/rif/ , Jazz.
n.
1. a melodic phrase, often constantly repeated, forming an accompaniment or part of an accompaniment for a soloist.
v.i.
2. to perform riffs.
[ 1930-35; perh. alter. and shortening of REFRAIN 2 ]
riff 2
/rif/ , v.t. Informal.
rif.