呼ㄏㄨhū牛ㄋㄧㄡˊniú呼ㄏㄨhū馬ㄇㄚˇmǎ

  1. 比喻是非本無一定的標準，毀譽隨人而定，不加計較。語本《莊子·天道》：「昔者子呼我牛也，而謂牛；呼我馬也，而謂之馬。苟有其實，人與之名而弗受，再受其殃。」也作「呼牛作馬」。

英to call sth a cow or a horse (idiom)​; it doesn't matter what you call it, Insult me if you want, I don't care what you call me.