Source : Webster's Revised Unabridged Dictionary (1913)

Thwite \Thwite\, v. t. [AS. [thorn]w[=i]tan. See {Whittle}, and
   cf. {Thwaite} a piece of land.]
   To cut or clip with a knife; to whittle. [Obs. or Prov. Eng.]
   --Chaucer.