c. 1600, "boil gently," probably from caudle "warm drink for invalids" (c. 1300), from Anglo-French caudel (c. 1300), ultimately from Latin calidium "warm drink, warm wine and water," neuter of calidus "hot," from calere "be warm" (see calorie). Verb meaning "treat tenderly" first recorded 1815 (in Jane Austen's "Emma"). Related: Coddled; coddling.