noun
argument; line of argument; debating position
Almost always used in the set phrase 論陣を張る (to present one's argument, to take a debating stance). Rarely used independently.
See also: 論陣を張る
彼は会議で堂々と論陣を張った。
He confidently presented his argument at the meeting.
新聞で新しい政策に反対する
The newspaper is mounting an argument against the new policy.