Keep an eye out.
[Idiom] KEEP AN EYE OUT. - Enhance Your Vigilance: Learn How through Idioms
Watch carefully.
When you "Keep an eye out," it means you are watching carefully for something in particular, staying alert and vigilant. It's like being a lookout, scanning the horizon for any signs or indications of the particular thing you're awaiting or wary of.
Example Sentences
Keep an eye out for the mailman today.
Be vigilant for the mailman today.
Could you keep an eye out for any special packages?
The speaker asks for vigilance regarding special packages.
Please keep an eye out for my sister at the station.
The speaker requests vigilance in watching for their sister at the station.
