LIAISE
intercede, mediate, intermediate, liaise, arbitrate
(verb) act between parties with a view to reconciling differences; āHe interceded in the family disputeā; āHe mediated a settlementā
Source: WordNet® 3.1
Etymology
Verb
liaise (third-person singular simple present liaises, present participle liaising, simple past and past participle liaised)
To establish a liaison.
To act between parties with a view to reconciling differences.
To cooperate, consult and discuss in order to come to a common solution.
Source: Wiktionary