expression, ichidan verb
play a role; act as; hold an office
Used when someone takes on a specific role, duty, or position, whether in a performance, an organization, or a formal capacity.
彼は会議で議長の役を勤めた。
He acted as chairperson at the meeting.
彼女は劇で主役を勤めることに
She ended up playing the lead role in the play.