noun
feeling of release; exhilaration; as if soaring on wings
A yojijukugo describing a euphoric sense of liberation, as if one has sprouted wings and is floating on air. Often used in literary or poetic contexts.
試験が終わって、羽化登仙の思いだ。
With exams over, I feel as if I'm soaring on air.
有頂天 means being ecstatic or in raptures, often with a nuance of being carried away. 羽化登仙 emphasizes a graceful, floating sense of release rather than wild excitement.
Derived from classical Chinese literature, combining 羽化 (transformation into a winged being) and 登仙 (ascending to the realm of immortals). The exact historical derivation is uncertain, but the phrase evokes the image of a Daoist immortal taking flight.