tip off

tip off idiom
Supply with secret or private information; also, warn or alert. For example, The broker often tipped her off about stocks about to go down in price, or Somehow they were tipped off and left the country before the police could catch them. [Colloquial; late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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