forswear
/fɔːˈsweə(r)/verb
(past forswore; past participle forsworn)with obj.
1- formal agree to give up or do without (something)〈正式〉发誓放弃; 坚决抛弃：
it is currently fashionable to forswear meat-eating in the interests of animal rights.
目前流行为保护动物权利而坚决不吃肉的做法。
1.1
forswear oneself/be forsworn
swear falsely; commit perjury发伪誓; 作伪证：I swore that I would lead us safely home and I do not mean to be forsworn.
我发誓会把大家安全带回家, 我也无意背弃誓言。
词源
Old English forswerian （see FOR-, SWEAR）.