scratch

A disruption, mark or shallow cut on a surface made by scratching.

"Her skin was covered with tiny scratches."

An act of scratching the skin to alleviate an itch or irritation.

"The dog sat up and had a good scratch."

A starting line (originally and simply, a line scratched in the ground), as in boxing.

To rub a surface with a sharp object, especially by a living creature to remove itching with nails, claws, etc.

"Could you please scratch my back?"

To rub the skin with rough material causing a sensation of irritation; to cause itching.

"I don't like that new scarf because it scratches my neck."

To mark a surface with a sharp object, thereby leaving a scratch (noun).

"A real diamond can easily scratch a pane of glass."

For or consisting of preliminary or tentative, incomplete, etc. work.

"This is scratch paper, so go ahead and scribble whatever you want on it."

Hastily assembled, arranged or constructed, from whatever materials are to hand, with little or no preparation

(from scratchpad) Relating to a data structure or recording medium attached to a machine for testing or temporary use.