The peel of a fruit such as a lemon or an apple is its skin.

When you peel fruit or vegetables, you remove their skins.

If you peel off something that has been sticking to a surface or if it peels off, it comes away from the surface.

If a surface is peeling, the paint on it is coming away.

If you are peeling or if your skin is peeling, small pieces of skin are coming off, usually because you have been burned by the sun.