apple polisher

apple of someone's eye

The object of somebody's affections; a person (or sometimes a thing) that someone strongly prefers; a favorite, a loved one.

bad apple

A person who is not wholesome, honest, or trustworthy, especially one who has an adverse influence on others.

rotten apple

A bad person, especially one who has a corrupting influence on others.

the apple does not fall far from the tree

A child grows up to be similar to its parents, both in behavior and in physical characteristics.

wise apple

A smart aleck.