rif·fle 
(rĭfəl)
(rĭfəl)n.
1.
a. A rocky shoal or sandbar lying just below the surface of a waterway.
b. A stretch of choppy water caused by such a shoal or sandbar; a rapid.
c. A wave or ripple in such water.
2.
a. In mining, the sectional stone or wood bottom lining of a sluice, arranged for trapping mineral particles, as of gold.
b. A groove or block in such a lining.
3. Games The act or an instance of shuffling cards.
v. rif·fled, rif·fling, rif·fles
v.tr.
1. Games To shuffle (playing cards) by holding part of a deck in each hand and raising up the edges before releasing them to fall alternately in one stack.
2. To thumb through (the pages of a book, for example).
v.intr.
1. Games To shuffle cards.
2. To flow in rough waves or become choppy, as water.
[Possibly blend of RIPPLE1 and RUFFLE1.]
riffle