give (one) 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.
See also: give, head, up
Farlex Dictionary of Idioms.
See also:
  • give (one) the works
  • give (one) a fresh start
  • give (one) static
  • don't give (something) a second thought
  • (Can I) give you a lift?
  • give anything (for something)
  • all in, be
  • be all in
  • give ground
  • give (one's) ground