unwritten law
默契的規則或常識
書面/口語·描述社會默契
英文釋義
a rule or expectation that is widely understood but not formally written down
例句
It's an unwritten law that you don't interrupt someone while they're speaking.
典故來源
源自社會契約概念：指雖無明文規定但被廣泛遵守的行為準則，如禮儀或道德規范。