任にんに当あたる

expression, godan verb (-ru)

undertake a duty; take on a responsibility

Used when someone formally or seriously takes on a role, task, or responsibility, often in official or organizational contexts.

• 彼かれは新あたらしいプロジェクトのリーダーの任にんに当あたった。

  He undertook the duty of leader for the new project.

• 委い員いん長ちょうの任にんに当あたるにあたり、一ひと言ことご挨あい拶さつ申もうし上あげます。

  As I take on the responsibility of committee chair, I would like to say a few words.