scratch

• scrape, abrasion; cut, small laceration; grating sound produced by scratching; scrawl, scribble; score of zero; starting line for a race; cash, money (slang)
scrape, rub; make a small cut or laceration; scrape with the fingernails to relieve an itch; make a grating sound; scribble, scrawl; achieve or obtain with difficulty; delete, cross out
if a sharp object scratches you, it rubs against your skin, cutting you slightly.
if you scratch an object, you accidentally make small cuts on it.
scratches on someone or something are small cuts or marks.
if you scratch a part of your body or scratch yourself, you rub your fingernails against your skin because it is itching.
if someone scratches from a race in which they had been entered or if they are scratched from it, they do not take part in it.
if you say that someone is scratching their head, you mean that they are thinking hard and trying to solve a problem.
if you do something from scratch, you do it without making use of anything that has been done before.
if something is not up to scratch, it is not good enough.
if you only scratch the surface of a problem or subject, you deal with it in some way, but not enough to solve or understand it fully.