forswear
v.
Old English forswerian "swear falsely" (intransitive), also "abandon or renounce on oath" (transitive), from for- "completely" + swerian "to swear" (see swear, v.). Related: Forswore; forsworn; forswearing.
〔李〕[for-=away 离；swear v.发誓→“swear away from doing sth. 发誓不干某事”→] v. swear to give up 发誓摈弃