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Example
受賞の知らせに、彼は得意忘形となって周囲への礼を忘れた。
When he heard about the award, he became so carried away that he forgot to thank the people around him.
Usage Notes
A literary four-character idiom. In everyday explanation it often describes someone so pleased or proud that they lose composure, though it can also refer to grasping the spirit of art and forgetting outward form.
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