Entry 1 sense Webster, 1913 Thirl · IPA /θɝl/ 01 v. t. To bore; to drill or thrill. See Thrill. imp. & p. p. Thirled; p. pr. & vb. n. Thirling 1. To bore; to drill or thrill. See Thrill.[Obs. or Prov.] See: Thrill “That with a spear was thirled his breast bone.” — Chaucer.