swear an oath 发誓
break one's word 违背诺言
perjury 伪证
betray trust 背叛信任
vow to do 发誓做
1. He forswore his old beliefs after the tragic accident.
在那场悲剧事故后，他背弃了他过去的信念。
2. The knight forswore loyalty to the king.
那骑士背弃了对国王的忠诚。
3. She forswore her family name in her memoir.
她在回忆录中背弃了自己的姓氏（意指否认其身份或关联）。
A: Did he actually forswear the oath he took on stage?
A：他真的背弃了他在舞台上发的誓吗？
B: Yes, the whole town was shocked by what he forswore.
B：是的，他背弃誓言的行为震惊了整个小镇。
1) 背弃誓言
2) 庄严否认
3) 违背承诺（正式/文学用语）
1. 违背誓言，背弃（forswear 的过去式）
2. 庄严地否认或宣誓放弃
e.g. He forswore the deal he had made with the partner.
他背弃了与合伙人达成的协议。
verb (past tense)
1. To deny solemnly on oath.
2. To break a solemn promise or oath.
Synonym: perjure, betray, renounce