appease or stop from feeling angry
placate - calm
A good way to remember how to use this term is to think of the related word ‘placid’, which means calm and peaceful. ‘Placate’, therefore, means to make somebody calm and peaceful. This is typically achieved through words or concessions.
I tried to placate Adam, but he was hell-bent on revenge.
The striking workers will not be placated by the latest weak offer from head office.
Vicky is not the sort of person to cause trouble. She is more of a placater.