expression, godan verb (-su)
play a role; serve a function; play a part
Used when someone or something fulfills an expected role, duty, or function in a situation, organization, or system.
彼はプロジェクトで重要な役割を果たした。
He played an important role in the project.
この部品は機械の中で大切
This part serves an important function in the machine.