vow [vaʊ]

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n.誓(言)，誓约；vt.&vi.起誓，立誓

to make a determined decision or promise to do something

My parents are under a vow to go to church every Sunday. 我父母许愿，每星期日都去做礼拜。
I am under a vow to drink no wine. 我已立誓戒酒。