Appeasement is the noun: the act of making someone less angry by giving them what they want, or a policy of doing that again and again. You can use it for a small bargain at home — a sweet just to stop the noise — but the heavy, famous use is political. In English, “the policy of appeasement” almost always points to the 1930s, when Britain and France hoped to avoid war by letting Hitler take more. That memory still sits on the word. In news and history, calling a plan appeasement is rarely a compliment. It says you bought a little time, and perhaps taught the other side that pressure works. The quieter sense — simply calming someone — is still possible, though actually many readers hear the darker one first. It is a formal word.