White horse
Danshu Baima, a Chinese idiom, Pinyin is d ā NSH ū B á im ǎ, which means that when the ancient emperors granted the meritorious officials the certificates of hereditary title and immunity, they killed the Baima to show their blood to stick to the oath. From the book of the Han Dynasty, Gao HuiGao's list of posthumous meritorious officials.
The origin of Idioms
In the book of the Han Dynasty, Gao HuiGao's list of posthumous meritorious officials states: "Shen Yi's faith in Danshu and his alliance with Baima." Yan shigu's note: "the alliance of white horse is the punishment of white horse, and its blood is the alliance."
Idiom usage
As an object or attribute; used of a covenant. example the founder of the country, the white horse. The sacred tablet of Qi Zhengong and Yu Wengong
White horse
would cut clean through iron as though it were mud - xuē tiě rú ní