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keep an eye on

vb. (context idiomatic English) To watch and pay attention to.

keep an eye on

v. follow with the eyes or the mind; "Keep an eye on the baby, please!"; "The world is watching Sarajevo"; "She followed the men with the binoculars" [syn: watch, observe, follow, watch over]

Usage examples of "keep an eye on".

I did what I could to find out who this guy was so I could keep an eye on him.