warn off

• • 通知(某人)离开，告诉某人避开，叫某人走开：

    The teacher warned the students off the thin ice.

    老师警告学生们不要到薄冰上去。

  • 不许(某人)上前、侵犯、闯入等[亦作 warn someone away]
  • (赛马)禁止…参加比赛(与 at 连用)：

    The rider was found guilty of giving the horse drugs and was warned off for a year.

    那个骑手被发现违章给马服用药物，被罚一年不准参加比赛。