eye(noun)

the part of the body with which one sees

Open your eyes; She has blue eyes.

eye(noun)

anything like or suggesting an eye, eg the hole in a needle, the loop or ring into which a hook connects etc.

eye(noun)

a talent for noticing and judging a particular type of thing

She has an eye for detail/colour/beauty.

eye(verb)

to look at, observe

The boys were eyeing the girls at the dance; The thief eyed the policeman warily.