heads-up /ˌhɛdzˈʌp/adjective 3noun 2heads up exclamation 1forms 4 adjective3 •With head directly above the neck, eyes front.A heads-up posture meant the pilot couldn't pay attention to his instruments. •Alert; vigilantGetting those marbles off the red carpet was a real heads-up move. •Containing only two players. noun2 •A warning or call to pay attention; an advisory notice; a notice of what is to happen; a holler.Send everyone a heads-up about the inspection tomorrow. •Involving two players. (usually said when there are only two players in the table; or, when all players except two folded)There were only two of us, so we started playing heads-up.There are seven players on the table. Five folded, the remaining two played heads-up until the showdown. heads up exclamation1 •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. formsheads ups · heads-ups · more heads-up · most heads-up