make sheep's eyes at sb
Means: to look at someone in a way that shows you love them
请看例句：
The lovers were making sheep's eyes at each other over the table.
恋人隔着桌子互送秋波。
Did you see that creep eyeing up every woman at the party?
你看见那个讨厌的家伙了吗？他对聚会上的每个女人都垂涎欲滴地打量不停。