The apple of one eye意思

The phrase "the apple of one's eye" is an English idiom that means something or someone that is very dear or precious to someone. It is often used to describe someone who is loved and cherished very much, like a favorite child or a treasured possession.

The phrase comes from the Bible, in Psalm 17:8, where the psalmist asks God to keep him "as the apple of [God's] eye." In ancient times, the term "apple of the eye" was used to refer to the pupil of the eye, which was thought to be particularly precious and valuable because it is the part of the eye through which we see the world.

Over time, the phrase came to be used more broadly to refer to anything or anyone that is held in high esteem or is considered especially important or valuable. It is a metaphorical way of saying that someone or something is like a precious jewel that is carefully guarded and treasured.