heads up


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heads up

(spoken)
look up because something may hit you
Usage notes: often shouted as a warning: Heads up! Watch out for the baseball!
See also: head, up

heads up

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]
See also: head, up