Webster's Revised Unabridged Dictionary · 1913

Threap

Threap (thrēp) , transitive verb

[Anglo-Saxon þreápian to reprove.]

1.
To call; to name. [Obsolete]
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. [Provincial English & Scottish] — Burns
3.
To beat, or thrash. [Provincial English] — Halliwell
4.
To cozen, or cheat. [Provincial English] — Halliwell

Threap , intransitive verb

To contend obstinately; to be pertinacious. [Provincial English & Scottish]
It's not for a man with a woman to threap. — Percy's Reliques

Threap , noun

An obstinate decision or determination; a pertinacious affirmation. [Provincial English & Scottish]
He was taken a threap that he would have it finished before the year was done. — Carlyle