改天换地 gǎitiānhuàndì to change the world Origin Definitions Defs Strokes Stroke Words Sentences Sents 改 gǎi verb to change to change, alter, or transform; to switch from one thing to another天 tiān noun sky sky; heavens; the space above the earth换 換 huàn verb to exchange to exchange; to trade; to switch; to convert currency地 dì noun earth The earth; the ground; land; soil; fields