keep (one's) weather eye open

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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

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