the apple of (one's) eye(redirected from the apple of their eye)
the apple of (one's) eye
A cherished or favored person. This phrase is thought to be Biblical in origin. My nephew is just the apple of my eye. He has five kids, but his only daughter is clearly the apple of his eye.
the apple of your eye
If someone is the apple of your eye, you love them very much and are very proud of them. I was the apple of my father's eye. Penny's only son was the apple of her eye. Note: In the past, the pupil in the eye was sometimes called the apple.
the apple of your eyea person or thing of whom you are extremely fond and proud.
In Old English, the phrase referred to the pupil of the eye, considered to be a globular solid body; it came to be used as a symbol of something cherished and watched over.