惟命是从 obey implicitly
Explanation
指绝对服从，完全听从别人的命令。
Refers to absolute obedience, completely obeying the orders of others.
Origin Story
春秋时期，楚庄王攻打郑国，郑襄公为了保住国家，亲自出城迎接楚庄王。他向楚庄王表示，愿意将郑国所有的一切都交给楚庄王，无论是土地、人口还是财富，他都将惟命是从。楚庄王被郑襄公的诚恳打动，最终决定退兵，并与郑国签订了盟约，避免了一场更大的战争。
During the Spring and Autumn period, King Zhuang of Chu attacked Zheng. To save his country, Duke Xiang of Zheng personally went out of the city to greet King Zhuang of Chu. He assured King Zhuang of Chu that he was willing to give everything of Zheng to King Zhuang of Chu, whether land, people or wealth; he would obey his command. King Zhuang of Chu was moved by Duke Xiang of Zheng's sincerity, and finally decided to withdraw his troops and conclude a treaty with Zheng, avoiding a larger war.
Usage
多用于书面语，形容对命令或指示的绝对服从。
Mostly used in written language to describe absolute obedience to commands or instructions.
Examples
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士兵们对首长的命令惟命是从。
bing shi men dui shou chang de ming ling wei ming shi cong.
The soldiers obeyed the commander's orders implicitly.
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他为人忠厚，对长辈惟命是从。
ta wei ren zhong hou, dui zhang bei wei ming shi cong
He is an honest man and obeys his elders implicitly.