a supporting role; a minor role (in a play, film, or story), someone who supports the lead
この映画では脇役の演技が特に高く評価された。
In this film, the supporting actors' performances were especially praised.
彼は長年脇役として映画界で活躍している。
He has been active in the film industry for many years as a supporting actor.
物語の脇役にも深い背景が描かれている。
The supporting characters in the story are also given deep backstories.