Meaning

noun a small wave on the surface of a liquid

noun shuffling by splitting the pack and interweaving the two halves at their corners

verb twitch or flutter

originFrom Danish [Term?] (“a groove”). Compare rifle (“to score, to make grooves”) and the past participle riflet (“scored, grooved, rifled”), riffeln with the same meaning. Also see rifle (“a rifled gun”).

Etymology from Wiktionary, CC BY-SA 3.0