留とめ役やく

noun

arbitrator; mediator; person who settles a dispute

Refers to a person who steps in to resolve a conflict or argument, often in a group setting. Can be used in both formal and informal contexts.

• 会かい議ぎで意い見けんが対たい立りつしたとき、彼かれが留とめ役やくを買かって出でた。

  When opinions clashed at the meeting, he stepped in as the arbitrator.

• 子こ供どもたちの喧けん嘩かに、いつも姉あねが留とめ役やくになる。

  The older sister always acts as the mediator in the children's fights.