翻天覆地

fān tiān fù dì

earth-shaking (change)

Character by character

翻fān
overturn

天tiān
sky

覆fù
flip

地dì
earth

四十多年来，中国发生了翻天覆地的变化。

In forty-odd years China has changed beyond recognition.

Tone: neutral.

Nearly always with 变化.

Learn this in Lesson 51 · HSK 6: 改革开放 (Reform and opening up)

A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. This lesson is free.