Source : Webster's Revised Unabridged Dictionary (1913)

Drawcansir \Draw"can*sir\, n. [From the name of a bullying
   braggart character in the play by George Villiers called
   ``The Rehearsal.'']
   A blustering, bullying fellow; a pot-valiant braggart; a
   bully.

         The leader was of an ugly look and gigantic stature; he
         acted like a drawcansir, sparing neither friend nor
         foe.                                     --Addison.