have your eye on somebody

Từ điển Oxford Advanced Learner 8th

have your ˈeye on sb idiom
1. to be watching sb carefully, especially to check that they do not do anything wrong
• And remember, I'll have my eye on you so you'd better behave.
2. to be thinking about asking sb out, offering sb a job, etc. because you think they are attractive, good at their job, etc
• He's got his eye on the new girl in your class.
Main entry: ↑eye_idiom