/ Dictionary / Index H heads up: Meaning and Definition of Find definitions for: heads' up' Pronunciation: [key] (used interjectionally to call attention to an impending danger or the need for immediate alertness). heads-up Pronunciation: (hedz'up"), [key] — adj. quick to grasp a situation and take advantage of opportunities; alert; resourceful. —n. a warning: sending a heads-up to the Pentagon about possible attacks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. headstrong head table Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language