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keep an eye on

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keep an eye on someone or something

 and have an eye on someone or something; keep one's eye(s) on someone or something; have one's eye on someone or something

Fig. to watch someone or something; to monitor someone or something closely. I have my eye on the apple tree. When the apples ripen, I'll harvest them. Please keep an eye on the baby. Will you please keep your eye on my house while I'm on vacation?

See also: eye, keep, on

keep an eye on somebody/something

also keep your eye on somebody/something

to watch or give your attention to someone or something The mother sat on the edge of the sandbox, keeping an eye on her sons as they played.

Usage notes: sometimes used with an adjective: The woman kept a close eye on her purse.

See also: eye, keep, on

keep an eye on

1. To watch over attentively; mind.

2. To watch closely or carefully: keep your eye on the ball.

See also: eye, keep, on