heads up

• Audio (General Australian):

  (file)

heads up

1. (idiomatic) Used as an informal warning, caution, or call for attention; pay attention!

   Heads up! I'm about to let go.

   Heads up! The boss is coming.

   • 2007 September 25, Bungie, Halo 3, spoken by Avery Johnson (David Scully), Microsoft Game Studios, Xbox 360, level/area: The Ark:

     Heads up, Marines! We got trouble.

• look out!, look sharp!, watch it!, watch out!, see also Thesaurus:heads up

heads up (plural heads ups)

1. Alternative spelling of heads-up

heads up (not comparable)

1. (poker) Containing only two players.

• heads up on Wikipedia.Wikipedia
• head up

• U-shaped