The Collaborative International Dictionary of English v.0.48:

Threap \Threap\, v. i.
   To contend obstinately; to be pertinacious. [Prov. Eng. &
   Scot.]
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         It's not for a man with a woman to threap. --Percy's
                                                  Reliques.
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The Collaborative International Dictionary of English v.0.48:

Threap \Threap\, n.
   An obstinate decision or determination; a pertinacious
   affirmation. [Prov. Eng. & Scot.]
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         He was taken a threap that he would have it finished
         before the year was done.                --Carlyle.
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The Collaborative International Dictionary of English v.0.48:

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