warn off
警告或勸阻某人，以防止他們做某事
口語·警告遠離
英文釋義
to advise or caution someone to stay away or not engage in a particular activity or situation
例句
The sign warns off anyone from entering the dangerous area.
典故來源
直接源于‘warn’（警告）與‘off’（離開）的搭配，意為通過警告使某人遠離某地或某事。