mediate between (someone)

Переводы
посредничать между (кем-то)
He had to mediate between the two friends who were arguing.
Ему пришлось посредничать между двумя друзьями, которые спорили.
Определения
To act as an intermediary or facilitator in a dispute or negotiation between two or more parties, helping them to reach an agreement or understanding.
Слова
mediate

глагол
посредничать