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mediation; good offices; go-between; intermediary; mediator; bridge (between)
building a bridge
彼は両国の外交的な橋渡し役を務めた。
He served as a diplomatic intermediary between the two countries.
彼は二つの会社の橋渡し役として活躍している。
He is active as a bridge between the two companies.
文化交流の橋渡し役として、長年貢献してきた。
I took on the role of cultural bridge.