约定俗成

yuēdìng-súchéng

established by popular usage; customary convention (idiom)

HSK 7-9

Pronunciation

yuēdìng-súchéng

许多汉字的读音是约定俗成的，后人不能随意更改。

Xǔduō Hànzì de dúyīn shì yuēdìng-súchéng de, hòurén bùnéng suíyì gēnggǎi.

The pronunciations of many Chinese characters are established by popular usage, and later generations cannot change them at will.

One fixed sample