conciliate - appease
To 'conciliate' means to end a disagreement or appease somebody who is angry or discontented. This is usually achieved through persuasion, offering gifts, or making concessions and requires a degree of patience, diplomacy, and maturity. For that reason, the term is almost always used in a positive sense.
I deal with disgruntled customers every day but I can never show annoyance. My job is to conciliate, not aggravate.
I wanted to end my dispute with Chris, so as a gesture of conciliation, I sent him a nice bottle of wine.
Some of the things I said in the last meeting were a little harsh and caused offence, so I intend to take a more conciliatory approach this time.