Keep an Eye On

What does the idiom “keep an eye on” mean?

Definition:
To keep an eye on something or someone is to watch it periodically, to keep it under surveillance.

For example:
“I’m leaving my son with you for the day. Please keep an eye on him.”

“Keep an eye on aluminum prices. When they rise, that will be the time to invest.”

If you keep a close eye on something, that means to watch it carefully.

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