仲裁

arbitration

t͡ɕ ɨː s a̠ i
noun Rare #39,009
arbitration
JA: 両社は第三者の仲裁を受けることにした。
EN: The two companies decided to accept arbitration by a third party.

やっと仲裁入って

Finally, someone stepped in to mediate.

— 七人の侍 (1954)

彼女の仲裁私たちの口論を終わらせた

Her mediation ended our argument.

口論ちょうど激しいときに彼が仲裁に入った

He stepped in to mediate just as the argument was getting heated.

彼が仲裁してその場丸く収めた

He mediated and smoothed things over.

Sounds similar to