Go-between (noun)

1. A person who acts as an intermediary between two parties.
2. A person who acts as a mediator or intermediary.

Origin:

From the act of going between two parties to facilitate communication or negotiation.

Examples:

1. The go-between was able to successfully negotiate a deal between the two companies.
2. She acted as a go-between to help resolve the dispute between her friends.
3. He was a go-between in the peace talks between the two countries.
4. The go-between was able to arrange a meeting between the CEO and the union representatives.
5. The lawyer acted as a go-between to negotiate a settlement in the legal case.