The ancient governors agreed to cut off the cow's ear and blood, and the representatives of the main allies held plates containing the cow's ear. Therefore, it is called the main ally. The latter generally refers to the most authoritative position in one aspect.

The Origin of the Allusions of "Catch the Cow's Ear"

"Being the best" means "champion" and "first". After all, what does the cow's ear have to do with the first place?

According to Zuo Zhuan's seventeen years of mourning for the public, at that time, governors of various countries concluded a Covenant and held a "blood alliance" ceremony. First, cut off the cow's ear and take blood, and put it on a pearl plate, which is held by the main ally. At that time, it was called "Petunia Ear".

The leader of the alliance took the lead in smearing the blood of cows worshiping the gods of heaven and earth on their mouths, and then they bled one after another, indicating that they had the gods of heaven and earth as a mirror, and they should stick to the Covenant and keep their promises. Whoever breaks the contract will be punished by the gods and will eventually die like an ox. This "blood alliance" ceremony was very grand in ancient times.

Therefore, "holding the cow's ear" was originally a ceremony, and later it generally refers to people who are in a leading position in a certain aspect, and it is also synonymous with "first"