Etymology
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heads-up (adj.)

"clever, alert," 1926, from warning cry "heads up!" (i.e. "look up!"). As a noun, "a notification, a warning," by 1988.

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Definitions of heads-up
1
heads-up (n.)
a warning message;
he sent a heads-up to the District Attorney
2
heads-up (adj.)
fully alert and watchful;
played heads-up ball
Synonyms: wide-awake
From wordnet.princeton.edu