1 Spin quickly and lightly round, especially repeatedly.
1.1 with object Cause to rotate.
1 An act of spinning.
1.1 A spiralling or swirling shape, especially a flourish made with a pen.
Late 16th century probably an alteration (by association with whirl) of tirl, a variant of archaic trill ‘twiddle, spin’.
Theresa thrilled the judges and audience alike with her scintillating twirls and athletic leaps.