keep (one's) weather eye open

keep (one's) weather eye open

An instruction to monitor someone or something, often because the person or thing in question may turn out to be dangerous. I think Tom's a thief, so keep your weather eye open around him. He needs to keep his weather eye open with this storm that's brewing, in case he has to evacuate.
See also: eye, keep, open, weather
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

keep one's weather eye open

Fig. to watch for something (to happen); to be on the alert (for something); to be on guard. Some trouble is brewing. Keep your weather eye open. Try to be more alert. Learn to keep your weather eye open.
See also: eye, keep, open, weather
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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