abjure
他发誓放弃以前的宗教信仰。
He swore to ___abjure his former religious beliefs.
这位前党员在国家电视台上公开宣布断绝政治关系，并谴责了领导层。
The former party member publicly ___abjured his political ties, denouncing the leadership on national television.
要成为公民，申请人必须正式宣誓放弃对所有外国势力的效忠。
To become a citizen, the applicant must ___abjure all previous allegiances to foreign powers.