Meaning

verb utter obscenities or profanities

verb to declare or affirm solemnly and formally as true

verb promise solemnly; take an oath

originFrom Middle English sworen, isworen, from Old English sworen, ġesworen, from Proto-West Germanic *swaran, *giswaran, from Proto-Germanic *swaranaz, past participle of Proto-Germanic *swarjaną (“to swear”), equivalent to swear + -en.

Etymology from Wiktionary, CC BY-SA 3.0