heads up
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heads up
(hĕdz)interj.
Used as a warning to watch out for a potential source of danger, as at a construction site.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
heads up
n
chiefly US and Canadian a tip-off or small amount of information given in advance
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014