What does “keep an eye open” mean?

to look for sb / sth while you are doing other things

How is “keep an eye open” used?

In The Godfather Part III (1990), one line is: “-Do you keep an eye out for them? -Yes.”

The clip at the top of this page is from The Godfather Part III (1990).

-Do you keep an eye out for them? -Yes.

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