apple
"Apple" is a straightforward word with a couple of meanings. Most commonly it refers to the fruit, but it also appears in some well-known figurative expressions. Here are the most useful senses.
When someone says a person is 'the apple of their eye', they mean that person is very precious and loved. This is a fixed expression — you would not use 'apple' alone in this figurative way, but the phrase is very common in English.
everyday language, relationships · Modern, widely used — the phrase has old roots but is still common today · figurative