To come between the parties in a dispute; intervene.

调停介入到争吵的双方中；

youdao

Any Contracting Party which is not a Party to the dispute may intervene in the proceedings with the consent of the arbitral tribunal.

经仲裁法庭同意，非争端当事方的任何缔约方都可以参与仲裁程序。

youdao

Twenty-year-old twins Leon and Raquel Papu, sophomores at Babson and Tufts University, respectively, have called upon their BCCG concierge to intervene in a landlord dispute, wait for a plumber and line up Boston Celtics tickets.

WSJ: Forget the Old College Try, Ring the Concierge