A piece of food left over from a meal. Don't give the dog another table scrap, I don't want him to get sick. We spend all day cooking their food, and all we get to eat are their table scraps.

Among other unwanted or unused things. Typically used after the verbs "throw" or "toss." It was disheartening to have something that took up so much of my time and energy end up on the scrap heap, but that's just the nature of the industry. It felt like I'd been thrown on the scrap heap after Janice left me.

To completely discard someone or something that is unwanted, especially in an unceremonious way. The phrase implies that the thing being discarded is being treated as worthless, completely irredeemable, or not worth fixing. The entire design is in danger of getting thrown on the scrap heap if we can't solve the overheating issue. Fred's worked here for 30 years and they just throw him on the scrap heap like that? That ain't right.