vow
🇺🇸
/vaʊ/
🇬🇧
/vaʊ/
to make a serious promise to do something
They vow to always help each other.
彼らはいつもお互いを助けると誓います。
a serious promise to do something, often in religion
The monk made a vow to live simply.
その僧侶は質素に生きることを誓いました。