Synonyms for arbitrate

settle peacefully, adjust differences, smooth out, reconcile, employ diplomacy, bring before a referee, hear both sides, act as arbiter, referee, parley, placate, bring to terms, decide between opposing parties, intervene, intercede, conciliate, step in, mediate, interpose, negotiate, come between, submit to arbitration, straighten out, meet halfway, come to terms, make an adjustment, pour oil on troubled waters*; see also decide.