天旋地转 Heaven and earth spin
Explanation
形容天地旋转。比喻巨大的变化，也形容头晕眼花的感觉。
Describes the earth rotating. A metaphor for great changes, also describes a feeling of dizziness.
Origin Story
传说很久以前，一位名叫盘古的巨人开天辟地，从此天地便有了轮廓。那时天地混沌未分，盘古为了创造世界，挥舞巨斧，用力将天地分开。然而，这项工作极其艰巨，盘古每天都要用力顶天立地，让天地不至于再次合拢。时间一天天过去，盘古为了完成开天辟地的壮举，日夜不停地工作着。有一日，盘古感到极度的疲惫，他感到头晕目眩，天旋地转，整个世界仿佛都在旋转，他用力扶着撑天之柱，才能勉强支撑下去。尽管他感到无比痛苦，但盘古依然坚持不懈，最终完成了开天辟地的伟业，创造了我们如今生活的这片天地。开天辟地后，盘古也因过度劳累而化为万物，天地万物便因此而生生不息。
Legend has it that a long time ago, a giant named Pangu separated the heaven and earth, and since then, heaven and earth have had their shape. At that time, the heaven and earth were in chaos and undivided. In order to create the world, Pangu swung a giant axe and forcefully separated the heaven and earth. However, this work was extremely arduous, and Pangu had to work hard to support the heaven and earth every day to prevent them from merging again. As time went by, Pangu worked tirelessly day and night to accomplish this feat. One day, Pangu felt extremely tired; he felt dizzy, the world was spinning, and the whole world seemed to be rotating. He supported himself on a pillar that he used to hold up the heavens to barely keep on his feet. Despite the immense pain, Pangu persevered and finally completed this great work, creating the world in which we live. After creating the heaven and earth, Pangu, due to exhaustion, turned into everything; thus, heaven, earth and all things continued.
Usage
常用来形容事物变化巨大，也可形容头晕眼花的感觉。
Often used to describe the huge changes of things, but can also describe the feeling of dizziness.
Examples
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地震来时，天旋地转，房屋倒塌。
dizhen laishi, tianxiuandizhuan, fangwu daota.
When the earthquake came, the world turned upside down, and the houses collapsed.
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他晕车晕得很厉害，感觉天旋地转。
ta yunche yun de hen lihai, ganjue tianxiuandizhuan
He's severely carsick, he feels dizzy and the world is spinning around him.