scratch

A scratch is a mark made by a sharp object against another object.

Example: I found a scratch on my car, so I had to get paint to cover it.

If something is made from scratch, then it was made without anything that existed or was prepared before.

Example: It took us all afternoon to make the pizzas from scratch.

If you scratch you use a sharp object to make a mark on another object.

If you scratch you rub a part of your body, because you feel an itch.

Example: I scratched my back as it felt very itchy.