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c.1300, from Anglo-French assuager, Old French assoagier "soften, moderate, alleviate, calm, soothe, pacify," from Vulgar Latin *adsuaviare, from Latin ad- "to" (see ad-) + suavis "sweet, agreeable" (see sweet). For sound development in French, cf. deluge from Latin diluvium, abridge from abbreviare. Related: Assuaged; assuaging.