n. a short, repeated line of music played by a particular performer. : Jim just sat there and forgot his riff.
n. a digression while speaking. (From sense 1.) : If she didn't make so many riffs while she spoke, we could understand her better.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
riff
"melodic phrase in jazz," 1935 (but said to have been used by musicians since c.1917), of uncertain origin, perhaps a shortened form of riffle (q.v.), or altered from refrain. The verb is attested from 1955.