脱胎换骨

1. • to shed one's mortal body and exchange one's bones (idiom) born again Daoist
2. • to turn over a new leaf
3. • fig. to change wholly
4. • to create from other material (story, artwork etc)

Character by character

• 脱(tuō)shed
• 胎(tāi)fetus
• 换(huàn)exchange
• 骨(gǔ)bone