v. t.
v. i. To contend obstinately; to be pertinacious. [ Prov. Eng. & Scot. ] [ 1913 Webster ]
It's not for a man with a woman to threap. Percy's Reliques. [ 1913 Webster ]
n. An obstinate decision or determination; a pertinacious affirmation. [ Prov. Eng. & Scot. ] [ 1913 Webster ]
He was taken a threap that he would have it finished before the year was done. Carlyle. [ 1913 Webster ]