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Douglas Harper's Etymology Dictionary
scrap-heap

1803, from scrap (n.1) + heap (n.).

Wiktionary
scrap-heap

n. (alternative spelling of scrapheap English)

Usage examples of "scrap-heap".

We may also consider the primitive aspirated consonants kh, th, ph, pronounced more or less as in as in backhand, outhouse, scrap-heap (to borrow my own examples from Lesson One).

Removing his overall, Kerry laid it with his cane upon the scrap-heap, then he climbed down the ladder and found himself in the mouth of that low timbered tunnel, like a trenchwork, which owed its existence to the cunning craftsmanship of Sin Sin Wa.