c (1) : a rhythm where each beat of the measure is played as a triplet with the first and second parts of the triplet tied and the third part accented (2) : music played in a shuffle rhythm
A shuffle can also be a basic type of song in be-bop with a simple I,IV, V, I etc. type chord progression. It is similar to a Texas Two Step in execution but the back beat has a small difference in placement against the center of the beat. If the back beat is off your playing the wrong style...and they don't work with each other feeling wise at all.
Some fiddlers just call a tune a shuffle because it may or may not have what they consider a "shuffle" in it. On fiddle there are several different kinds of shuffles. arguably the most popular are the double and triple shuffles done with double stops...Both of these are heard in most versions of* Orange Blossom speacia*l. the double (two low then two high) is and older sound and the triple (two low then one high) is a more sycopated modern sound.