Source : Webster's Revised Unabridged Dictionary (1913)

Thirl \Thirl\, v. t. [imp. & p. p. {Thirled}; p. pr. & vb. n.
   {Thirling}.] [See {Thrill}.]
   To bore; to drill or thrill. See {Thrill}. [Obs. or Prov.]

         That with a spear was thirled his breast bone.
                                                  --Chaucer.