weather eye, to keep a

keep a weather eye on (someone or something)

To monitor someone or something closely, often because the person or thing in question may turn out to be dangerous. Primarily heard in UK, Australia. I need you to keep a weather eye on this crisis so that we can get the necessary supplies out quickly.
See also: eye, keep, on, weather
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

weather eye, to keep a

To remain on guard, to watch out for trouble. In maritime language keeping a weather eye means looking toward the wind to observe weather conditions and look for squalls. The term appeared in a Sailor’s Word-Book (Smyth, 1867) but by the end of the nineteenth century was being used figuratively for keeping any kind of careful watch. Thus Lee Thayer used it (Murder Is Out, 1942), “You know how to keep your weather eye lifting.”
See also: keep, to, weather
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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