吐故納新

1. • lit. to breathe out stale air and breathe in fresh (idiom, from Zhuangzi 庄子 zhuāngzǐ) fig. to get rid of the old and bring in the new

Character by character

• 吐(tǔ)spit
• 故(gù)happening
• 納(nà)surname Na
• 新(xīn)new