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.

Common Names:

Name	Pronounced	Usage
Shyla	-	English (Modern)
Jalil	-	Arabic, Persian
Katar	-	Armenian
Annelise	-	Danish
Dong	-	Chinese
Gregorius	-	Late Greek (Latinized)