honest broker

A person or party that is considered to be neutral and thus suitable to serve as a mediator.

Japanese Meaning

中立的な立場を維持し、両者の仲介または調停を行う人物や団体 / 公平な仲介者、信頼される第三者 / 偏見を持たずに交渉や調整を行う者

The UN hoped an honest broker could help negotiate the ceasefire between the warring factions.

国連は、公平で中立的な仲介者が交戦勢力間の停戦交渉を仲介することを期待していた。

Sense（1）

A person or party that is considered to be neutral and thus suitable to serve as a mediator.

honest brokers

（ plural ）