plight one's troth 许下誓言
plighted faith 许下的忠诚
plighted allegiance 许下的效忠
A: Did they exchange vows during the ceremony?
A：他们在仪式上交换誓言了吗？
B: Yes, they plighted their troth before the whole community.
B：是的，他们在整个社区面前许下了誓言。
1) 庄重地许下诺言
2) 缔结盟约或效忠
3) (文学语境) 许下婚姻誓言
1. 许诺；缔结（盟约、誓言等）
verb
1. To pledge or promise something solemnly, especially regarding loyalty or marriage.
Synonym: pledge, vow, swear