godan verb (-ru), intransitive verb
triumph; be elated with victory
Describes an openly proud, sometimes boastful, attitude after winning. Often carries a negative nuance of gloating.
彼は試合に勝って勝ち誇った顔をしていた。
He had a triumphant look on his face after winning the match.
勝ち誇
A gloating attitude invites resentment from others.