warn off

Verb

1. yi gargaɗin da zai sa wani ya yi nisanci ga wani abu <> warn+off (idiomatic)
2. 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. (McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.)
3. To notify someone to go or stay away: The sheriff warned them off the private property. (The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company.)

Google translation of warn off

says Warn off.