拼音：zhí niú ěr
注音：ㄓˊㄋㄧㄡˊㄦˇ
解释：古代诸侯订立盟约，要割牛耳歃血，由主盟国的代表拿着盛牛耳朵的盘子。故称主盟国为执牛耳。后泛指在某一方面居最有权威的地位。
出处：《左传·哀公十七年》：“诸侯盟，谁执牛耳？”
英语：bear the bell
The ancient princes made a covenant to cut off the blood of the cow's ears, and the representative of the main alliance took the plate containing the cow's ears. Therefore, it is called the main ally. The latter generally refers to the most authoritative position in a certain aspect.
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