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appeasement (n.)[appeasement 词源字典]: mid-15c., "pacification," from Middle French apeisement, Old French apaisement "appeasement, calming," noun of action from apaisier (see appease). First recorded 1919 in international political sense; not pejorative until failure of Chamberlain's policy toward Germany in 1939 (Methods of appeasement was Chamberlain's description of his policy).[appeasement etymology, appeasement origin, 英语词源]
becalm (v.): 1550s, from be- + calm. Related: Becalmed; becalming.
calm (v.): late 14c., from Old French calmer or from calm (adj.). Related: Calmed; calming.
sedation (n.): early 15c., "alleviation of pain;" 1540s, "act of making calm," from Middle French sédation and directly from Latin sedationem (nominative sedatio) "a quieting, assuaging, a calming," noun of action from past participle stem of sedare (see sedate (adj.)).
sedative (adj.): "tending to calm or soothe," early 15c., from Medieval Latin sedativus "calming, allaying," from sedat-, past participle stem of sedare, causative of sedere "to sit" (see sedentary). The noun derivative meaning "a sedative drug" is attested from 1785. Hence, "whatever soothes or allays."