誓う
verb
swear, vow, pledge
B1
保証として与える。
swear, vow, pledge
ちかう
B1Intermediate
B1
もう同じ失敗はしないと、自分自身に誓った。
I swore to myself that I would not make the same mistake again.
B2
家族を傷つけた相手への復讐を誓ったが、やがて考えを改めた。
He vowed revenge against the person who had hurt his family, but eventually changed his mind.