This is the 9890th most frequent Japanese word.
誓い
Oath; vow; pledge.
In this context, "誓い" entails a formal or solemn pledge to achieve a significant outcome or change.
この戦争の終結を誓います。
I vow the end of this war.
In this sentence, "誓い" (vow) represents a commitment or promise, specifically a vow of love.
私は彼女と永遠の愛を誓いました。
I vowed eternal love to her.
Here, "誓い" refers to a promise made regarding one's effort or dedication to a task or goal.