The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]

         That with a spear was thirled his breast bone.
                                                  --Chaucer.
   [1913 Webster]