A (small) piece; a fragment; a detached, incomplete portion.
"The two rivals started a scrap over who got to park in front of the shop."
6
A fight, tussle, skirmish.
In plain English: Scrap is leftover material that has no use and needs to be thrown away.
"The old metal scrap was piled in the corner of the garage waiting to be recycled."
Usage: Use scrap to refer either to a small leftover piece of material or to a brief physical altercation. When describing a conflict, it often implies an informal scuffle rather than a formal battle.
The word scrap comes from the Old Norse verb meaning "to scrape" or "scratch." It entered English via Middle English, carrying with it that original sense of scratching away material.