脱胎换骨 (脫胎換骨) tuō tāi huàn gǔ

tuō tāi huàn gǔ set phrase to shed one's mortal body and exchange one's bones / to change wholly
Domain: Idiom 成语
Notes: (CC-CEDICT '脫胎換骨'; Guoyu '脫胎換骨')