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3. keep one eye on

keep one eye on

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keep one eye on somebody/something

also have one eye on somebody/something

to give part of your attention to one person or thing Jim continued to talk to me, but he kept one eye on the clock to be sure he wouldn't be late.

Usage notes: sometimes used in the form with one eye on someone or something: She read her newspaper with one eye on arrivals board to see is his train had come in.

See also: eye, keep, on, one