To Rejoice
To Become Happy, To Be Glad
intransitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means rejoice so the verb vocab version is to rejoice. Though to become happy probably sounds a little more natural.
You start to rejoice by saying, "Yo, rock on (よろこ)!" Now you know how to rejoice from now on. At church or temple? "Yo, rock on!" Perfect.
息子の喜ぶ顔が見れてとてもうれしいです。
I am very happy to see my son's happy face.
私のファンだと言う人が一人でもいたら、泣いて喜びます！
If even one person claims to be my fan, I will weep and rejoice!
他人の成功を喜べない自分がキライです。
I hate myself for not being able to enjoy the success of others.