1.  riffle(n = noun.event) ripple, rippling, wavelet - a small wave on the surface of a liquid;
is a kind of moving ridge, wave
Derived form verb riffle₃

2.  riffle(n = noun.act) - shuffling by splitting the pack and interweaving the two halves at their corners;
is a kind of make, shuffle, shuffling
Derived form verb riffle₄

1.  riffle(v = verb.contact) flick, ruffle - twitch or flutter; "the paper flicked"
is one way to displace, move
Sample sentences: Somebody ----s something

2.  riffle(v = verb.perception) flick, flip, leaf, riff, thumb - look through a book or other written material; "He thumbed through the report"; "She leafed through the volume"
is one way to peruse
Sample sentences: The customs agents riffle the bags for drugs

3.  riffle(v = verb.motion) cockle, ripple, ruffle, undulate - stir up (water) so as to form ripples;
is one way to flow, flux
Derived form noun riffle₁
Sample sentences: Something ----s; Somebody ----s something

4.  riffle(v = verb.contact) - shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix;
is one way to mix, ruffle, shuffle
Derived form noun riffle₂
Sample sentences: Somebody ----s something

1.  A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed; also, one of the cleats, grooves, or steps in such a trough. Also called ripple. [1913 Webster]

2.  A ripple in a stream or current of water; also, a place where the water ripples, as on a shallow rapid.
"The bass have left the cool depth beside the rock and are on the riffle or just below it." [Webster 1913 Suppl.]

riffle, v. & n.
--v.
1 tr. a turn (pages) in quick succession. b shuffle (playing-cards) esp. by flexing and combining the two halves of a pack.
2 intr. (often foll. by through) leaf quickly (through pages).
--n.
1 the act or an instance of riffling.
2 (in gold-washing) a groove or slat set in a trough or sluice to catch gold particles.
3 US a a shallow part of a stream where the water flows brokenly. b a patch of waves or ripples on water.

Etymology:
perh. var. of RUFFLE

N  river, running water, jet, spirt, spurt, squirt, spout, spray, splash, rush, gush, jet d'eau, sluice, water spout, water fall, cascade, force, foss, lin, linn, ghyll, Niagara, cataract, rapids, white water, catadupe, cataclysm, debacle, inundation, deluge, chute, washout, rain, rainfall, serein, shower, scud, downpour, driving rain, drenching rain, cloudburst, hyetology, hyetography, predominance of Aquarius, reign of St. Swithin, mizzle, drizzle, stillicidum, plash, dropping, falling weather, northeaster, hurricane, typhoon, stream, course, flux, flow, profluence, effluence, defluxion, flowing, current, tide, race, coulee, spring, artesian well, fount, fountain, rill, rivulet, gill, gullet, rillet, streamlet, brooklet, branch, runnel, sike, burn, beck, creek, brook, bayou, stream, river, reach, tributary, geyser, spout, waterspout, body of water, torrent, rapids, flush, flood, swash, spring tide, high tide, full tide, bore, tidal bore, eagre, hygre, fresh, freshet, indraught, reflux, undercurrent, eddy, vortex, gurge, whirlpool, Maelstrom, regurgitation, overflow, confluence, corrivation, wave, billow, surge, swell, ripple, anerythmon gelasma, beach comber, riffle, rollers, ground swell, surf, breakers, white horses, whitecaps, rough sea, heavy sea, high seas, cross sea, long sea, short sea, chopping sea, hydrodynamics, hydraulics, hydraulicostatics, rain gauge, flowmeter, pegology, irrigation, pump, watering pot, watering cart, hydrant, syringe, garden hose, lawn spray, bhisti, mussuk, fluent, diffluent, profluent, affluent, tidal, flowing, meandering, meandry, meandrous, fluvial, fluviatile, streamy, showery, rainy, pluvial, stillicidous, stillatitious, for men may come and men may go but I go on foreve, that old man river, he just keeps rolling along.