warn off
警告或劝阻某人，以防止他们做某事
口语·警告远离
英文释义
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.
典故来源
直接源于‘warn’（警告）与‘off’（离开）的搭配，意为通过警告使某人远离某地或某事。