keep a weather eye open

keep a 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 a weather eye open around him. I'd keep a weather eye open with this storm that's brewing—we may have 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.

keep a

/one's weather eye open
To keep watch; stay alert.
See also: keep
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.
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