noun
A person who acts as a go-between or intermediary in transactions, negotiations, or communication.
貿易の中継ぎ人として、彼は多くの契約をまとめた。
As a trade intermediary, he brokered many contracts.
交渉では中継ぎ人を立てることにした。
We decided to use an agent for the negotiations.
Compound of 中継ぎ (relaying, intermediation) and 人 (person). The exact historical derivation is uncertain, but the word transparently means 'person who relays or acts as an intermediary'.