To mediate or intervene between two parties; to act as an intermediary or go-between.
彼は両社の間に立って契約条件の調整を行った。
He stood between the two companies and adjusted the contract terms.
友人同士の喧嘩の際、私は間に立って仲直りさせた。
When my friends had a fight, I intervened and got them to make up.
子供が二人の間に立って、話を聞いていた。
The child stood between the two of them and listened.
彼女は仲介者として両者の間に立った。
She acted as a mediator between the two parties.