悦えつに入いる

expression, godan verb (-ru)

be pleased with oneself; gloat; glow with self-satisfaction

Describes a smug, self-congratulatory pleasure, often when someone is privately savoring their own success or cleverness. Can carry a negative nuance of gloating.

• 彼かれは自じ分ぶんの手て柄がらを思おもい出だして、一人ひとりで悦えつに入いっていた。

  He was gloating to himself, recalling his own achievement.