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3. heads up

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