仲なかに入はいる

expression, godan verb (-ru)

act as an intermediary; mediate; step in between

Used when someone intervenes in a dispute, negotiation, or relationship to help both sides reach an understanding.

• けんかしている二人ふたりの仲なかに入はいって、話はなし合あいを促うながした。

  I mediated between the two who were fighting and encouraged them to talk it out.

• 取とり引ひき先さきとの交こう渉しょうで、彼かれが仲なかに入はいってくれた。

  He acted as an intermediary in the negotiations with the client.