論ろん陣じんを張はる

expression, godan verb (-ru)

take a firm stand; argue vigorously

Used when someone presents a strong, well-prepared argument or position, often in a debate or dispute. The image is of deploying a battle line of arguments.

• 彼かれは会かい議ぎで論ろん陣じんを張はって、新しん企き画かくの必ひつ要よう性せいを訴うったえた。

  He took a firm stand at the meeting and argued for the necessity of the new project.

• 野や党とうは国こっ会かいで論ろん陣じんを張はり、法ほう案あんに反はん対たいした。

  The opposition party argued vigorously in the Diet and opposed the bill.