Definition of "heads up" in English

Interjection

1. 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.

Noun

1. Alternative spelling of heads-up.

Verb

1. third-person singular simple present indicative of head up

Adjective

1. Containing only two players.