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1754, "to make choppy water," American English, perhaps a variant of ruffle "make rough." The word meaning "shuffle" (cards) is first recorded 1894, probably echoic; hence that of "skim, leaf through quickly" (of papers, etc.) is from 1922. Related: Riffled; riffling.
A hard swing at the ball; ripple: gives it a really good solid riffle
[1932+ Baseball; probably fr ripple fr rip]
: Give that deck a good riffleverb
To shuffle playing cards (1894+ Cardplaying)