catch (one's) eye
1. To attract one's attention, often by making eye contact. The server still hasn't taken our order—we just can't catch her eye.
2. To attract one's interest, especially due to being visually appealing or attractive. That dress in the window caught my eye immediately—can I try it on? Your store needs a bold sign that will catch the eye of anyone walking down the street. I see that the new girl in school has caught your eye.
catch someone's eye
and get someone's eye 1. Fig. to establish eye contact with someone; to attract someone's attention. The shiny red car caught Mary's eye. When Tom had her eye, he smiled at her.
2. Fig. to appear and attract someone's interest. A small red car passing by caught my eye. One of the books on the top shelf caught my eye, and I took it down to look at it.