1. 发誓弃绝，郑重声明放弃(信仰、生活方式等）
If you abjure something such as a belief or way of life, you state publicly that you will give it up or that you reject it.

1. formally reject or disavow a formerly held belief, usually under pressure

e.g. He retracted his earlier statements about his religion
She abjured her beliefs

Synonym: recantforswearretractresile