Source : Webster's Revised Unabridged Dictionary (1913)

Threap \Threap\, n.
   An obstinate decision or determination; a pertinacious
   affirmation. [Prov. Eng. & Scot.]

         He was taken a threap that he would have it finished
         before the year was done.                --Carlyle.

Threap \Threap\ (thr[=e]p), v. t. [imp. & p. p. {Threaped}; p.
   pr. & vb. n. {Threaping}.] [AS. [thorn]re['a]pian to
   reprove.] [Written also {threpe}, and {threip}.]
   1. To call; to name. [Obs.]

   2. To maintain obstinately against denial or contradiction;
      also, to contend or argue against (another) with
      obstinacy; to chide; as, he threaped me down that it was
      so. [Prov. Eng. & Scot.] --Burns.

   3. To beat, or thrash. [Prov. Eng.] --Halliwell.

   4. To cozen, or cheat. [Prov. Eng.] --Halliwell.

Threap \Threap\, v. i.
   To contend obstinately; to be pertinacious. [Prov. Eng. &
   Scot.]

         It's not for a man with a woman to threap. --Percy's
                                                  Reliques.