IPA: /əˈpiːzər/
KK: /əˈpiːzər/
A person who tries to calm someone down or make them less angry by giving in to their demands or requests.
The leader was seen as an appeaser for agreeing to the demands of the protestors.
Appeaser → It is formed from "appease" (from Old French *apaisier*, meaning to calm or pacify) and "-er" (meaning a person who). An appeaser is a person who calms or pacifies others.
Think of someone who is calming others down — that's what an appeaser does, as they are a person who 'appeases'.