The Collaborative International Dictionary of English v.0.48:

Twirl \Twirl\, v. i.
   To revolve with velocity; to be whirled round rapidly.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twirl \Twirl\, n.
   1. The act of twirling; a rapid circular motion; a whirl or
      whirling; quick rotation.
      [1913 Webster]

   2. A twist; a convolution. --Woodward.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twirl \Twirl\ (tw[~e]rl), v. t. [imp. & p. p. Twirled
   (tw[~e]rld); p. pr. & vb. n. Twirling.] [Cf. AS.
   [thorn]wiril a churn staff, a stirrer, flail, [thorn]weran,
   [=a][thorn]weran, to agitate, twirl, G. zwirlen, quirlen,
   querlen to twirl, to turn round or about, quirl a twirling
   stick, OHG. dweran to twirl, stir. Cf. Trowel.]
   To move or turn round rapidly; to whirl round; to move and
   turn rapidly with the fingers.
   [1913 Webster]

         See ruddy maids,
         Some taught with dexterous hand to twirl the wheel.
                                                  --Dodsley.
   [1913 Webster]

         No more beneath soft eve's consenting star
         Fandango twirls his jocund castanet.     --Byron.
   [1913 Webster]

WordNet (r) 3.0 (2006):

twirl
    n 1: a sharp bend in a line produced when a line having a loop
         is pulled tight [syn: kink, twist, twirl]
    2: the act of rotating rapidly; "he gave the crank a spin"; "it
       broke off after much twisting" [syn: spin, twirl,
       twist, twisting, whirl]
    v 1: turn in a twisting or spinning motion; "The leaves swirled
         in the autumn wind" [syn: twirl, swirl, twiddle,
         whirl]
    2: cause to spin; "spin a coin" [syn: whirl, birl, spin,
       twirl]