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riffle (v.)

1754, "to make choppy water," American English, perhaps a variant of ruffle "make rough." The word meaning "shuffle" (cards) is recorded by 1894, perhaps echoic; hence "skim, leaf through quickly" (of papers, etc.), by 1922. The noun meaning "rapid formed by a rocky obstruction in the bed of a river" is by 1785. Related: Riffled; riffling.

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Definitions of riffle from WordNet
1
riffle (v.)
twitch or flutter;
Synonyms: flick / ruffle
riffle (v.)
stir up (water) so as to form ripples;
Synonyms: ripple / ruffle / cockle / undulate
riffle (v.)
shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix;
riffle (v.)
look through a book or other written material;
Synonyms: flick / flip / thumb / leaf / riff
2
riffle (n.)
a small wave on the surface of a liquid;
Synonyms: ripple / rippling / wavelet
riffle (n.)
shuffling by splitting the pack and interweaving the two halves at their corners;
From wordnet.princeton.edu