天崩地裂 The sky collapses and the earth splits
Explanation
形容变化巨大，如同天塌地陷那样，多用来形容重大事件或灾难。
Describes a huge change, like the sky collapsing and the earth splitting, often used to describe major events or disasters.
Origin Story
传说中，盘古开天辟地后，天地之间发生了剧烈的震动。大地隆隆作响，山川崩塌，河流改道，仿佛天崩地裂一般。这时，盘古为了阻止天地再次合拢，便用自己的身体支撑着天，用自己的脚掌抵住地，日夜不停地奋力撑着。就这样，盘古在天地之间苦苦支撑了数万年，直到精疲力尽，最终倒地而亡。盘古倒地后，他的身体也发生了奇妙的变化。他的头变成了高山，他的眼睛变成了日月，他的四肢变成了四极，他的躯干变成了大地，他的血液变成了江河，他的肌肉变成了山脉，他的毛发变成了草木……天地之间的一切，都和盘古的身体息息相关，也因为盘古的牺牲而得以永久地存在。
Legend has it that after Pangu created the heaven and earth, there was a violent earthquake. The earth rumbled, mountains collapsed, rivers changed course, as if the sky was collapsing and the earth was splitting. At this time, Pangu, in order to prevent the heaven and earth from closing again, used his own body to support the heaven, and used his own feet to hold the earth, working hard day and night. In this way, Pangu supported the heaven and earth for tens of thousands of years, until he was exhausted and finally died. After Pangu fell to the ground, his body also underwent a magical change. His head became a high mountain, his eyes became the sun and the moon, his limbs became the four extremities, his torso became the earth, his blood became rivers, his muscles became mountains, his hair became plants and trees... Everything between heaven and earth was inextricably linked to Pangu's body, and also existed permanently because of Pangu's sacrifice.
Usage
这个成语用于形容巨大的变化，多用于描述重大的事件或灾难。
This idiom is used to describe huge changes, often used to describe major events or disasters.
Examples
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地震发生时，山崩地裂，房屋倒塌。
di zhen fa sheng shi, shan beng di lie, fang wu dao ta.
When the earthquake occurred, there were landslides and earthquakes, and houses collapsed.
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改革开放以来，中国的经济发生了天崩地裂的变化。
gai ge kai fang yi lai, zhong guo de jing ji fa sheng le tian beng di lie de bian hua.
Since the opening and reform, China's economy has undergone a dramatic change.