This is the 2719th most frequent Japanese word.
祝う
To celebrate.
Here '祝う' is used in the context of celebrating an event related to a person's achievement.
私たちは彼の成功を祝うためにパーティーを開いた。
We held a party to celebrate his success.
In this sentence, '祝う' is used to denote the act of celebrating an annual occasion.
毎年新年を祝う伝統があります。
We have a tradition of celebrating the New Year every year.
Here, '祝う' conveys the action of preparing for a celebration focused on an individual's special day.