oft (adv.)youdaoicibaDictYouDict[oft 词源字典]
Old English oft "often, frequently," from Proto-Germanic *ufta- "frequently" (cognates: Old Frisian ofta, Danish ofte, Old High German ofto, German oft, Old Norse opt, Gothic ufta "often"), of unknown origin. Archaic except in compounds (such as oft-told), and replaced by its derivative often.[oft etymology, oft origin, 英语词源]