heads-up

US /ˈhedz ʌp/
UK /ˈhedz ʌp/
"heads-up" picture
1.

a warning or piece of information given in advance

:
Just wanted to give you a heads-up that the meeting time has changed.
Thanks for the heads-up about the road closure.
1.

alert and attentive

:
Stay heads-up for any changes in the weather.
The coach told the players to keep their heads-up during the game.