warn off

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warn (one) off (from someone or something)

To caution someone to leave or not to come near something. The first noun or pronoun can also come after "off." The government put up signs warning off any potential hikers from the area. I held my shotgun across my chest as I warned the ruffians off from my land.
See also: off, someone, warn
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

warn someone off

to advise a person to stay away. We placed a guard outside the door to warn people off until the gas leak could be fixed. The guards warned off everyone in the vicinity.
See also: off, warn
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

warn off

To notify someone to go or stay away: The sheriff warned them off the private property.
See also: off, warn
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
I myself was fined pounds 60 (but pounds 30 if one pays up promptly).I have since managed to warn off others who,like myself,parked unknowingly; and it is upsetting,not just because of the fine,but I deplore able drivers who deliberately use such areas.
Hampton's thug soon tries to violently warn off McQuire.
More than 30 straw men are expected to be on display as the village does its best to well and truly warn off birds for the day.
It had hoped to hold swift inquiries into whether to warn off a number of men linked last month to an international
Pensioners will also be able to detach a poster which can be placed in their window to warn off callers.
People flirt with smiles and warn off rivals with sneers.
At the Morris Tribunal yesterday, retired Garda Patrick Togher said he was told a member of the force's complaints board had asked the then Fine Gael leader Mr Bruton to warn off his party colleague.