say it: RIF-uhl
riffle is a verb and noun meaning "twitch or flutter". It carries 6 recorded senses.
shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix
card game
shuffling by splitting the pack and interweaving the two halves at their corners
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for riffle come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.