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1. Literally, to orient someone or something in the proper direction. In this usage, a noun or pronoun can be used between "head" and "up." Head up the animals, will you? We need to get them back into the barn.
2. To lead some group or delegation. Who will head up the committee for this initiative?
1. An interjection used as a warning for any imminent danger. "Heads up!" he shouted as the brick fell off the edge of the building. Heads up, the boss is looking for you and she looks angry!
2. noun A preliminary notice, especially of future difficulty, trouble, or danger; a warning. Often hyphenated. Make sure everyone gets the heads-up about the inspection tomorrow morning. We don't want anyone coming in unprepared. Hey, just a heads-up—the boss is in a foul mood, so don't do anything to attract attention to yourself! Just give me a heads-up if you need a ride.
head something up
1. Lit. to get something pointed in the right direction. (Especially a herd of cattle or a group of covered wagons.) Head those wagons up—we're moving out. Head up the wagons!
2. Fig. to be in charge of something; to be the head of some organization. I was asked to head the new committee up for the first year. Will you head up the committee for me?
Be in charge of, lead, as in She headed up the commission on conservation. [Colloquial; mid-1900s]
A warning to watch out for potential danger, as in Heads up, that tree is coming down now! The expression is generally in the form of an interjection. [c. 1940]