Source : Webster's Revised Unabridged Dictionary (1913)

Birl \Birl\, v. t. & i.
   To revolve or cause to revolve; to spin. [Scot.] --Sir W.
   Scott.

Birl \Birl\, v. t. & i. [AS. byrlian. [root]92.]
   To pour (beer or wine); to ply with drink; to drink; to
   carouse. [Obs. or Dial.] --Skelton.

Source : WordNet®

birl
     v 1: cause a floating log to rotate by treading [syn: {birle}]
     2: cause to spin; "spin a coin" [syn: {whirl}, {spin}, {twirl}]