约定俗成 yuēdìng-súchéng established by popular usage (idiom)
established by popular usage (idiom); common usage agreement; customary convention
怎么记住“约定俗成”: 约 make an appointment + 定 decide + 俗 social customs + 成 to become = established by popular usage (idiom).
汉字
用法
- Idiom: established by common usage/convention, not by rule - 这个说法是约定俗成的 (zhège shuōfǎ shì yuēdìng-súchéng de) this expression is fixed by convention.
- Used to explain why a term or practice is 'just how it's done' - accepted through custom over time.
- Common in language, naming, and social-custom discussions.