noun, noun or participle which takes 'suru'
arguing persistently; contentious discussion
Rare literary noun or suru-verb for stubborn, unreasonable arguing or wrangling. Mostly found in older texts or formal writing.
会議で横議に及ぶ者が出て、議論がまとまらなかった。
At the meeting, someone resorted to persistent arguing, and the discussion could not be settled.
Compound of 横 (sideways, unreasonable) and 議 (discussion, deliberation). The exact historical derivation is uncertain, but the spelling conventionally associates with stubborn or improper arguing.