give (one) a heads up(redirected from give them a heads up)
give (one) a heads up
To give one a preliminary notice, especially of future difficulty, trouble, or danger. "Heads up" is often hyphenated. Make sure to give everyone a heads up about the inspection tomorrow morning. We don't want anyone coming in unprepared. Just give me a heads-up if you need a ride.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.