"soaked or softened in water," 1820, earlier "resembling something that has been boiled a long time" (1590s), originally "boiled" (c. 1300), from Old English soden "boiled," strong past participle of seoþan "to cook, boil" (see seethe). For sense evolution from "heat in water" to "immerse in water" compare bath.[sodden etymology, sodden origin, 英语词源]