
Have your eye on somebody
Suspicion
Used when someone's behavior raises doubts or concerns.

The cashier had her eye on the shopper who kept looking around nervously.
Observation
Suggests ongoing, careful watching of someone's actions.

The teacher had his eye on students during the test to prevent cheating.
Vigilance
Implies being alert or ready for possible problems.

Parents always have their eye on the kids at the playground.
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