early 13c., probably from Old Norse skrapa "to scrape, erase," from Proto-Germanic *skrapojan (source also of Old English scrapian "to scrape," Dutch schrapen, German schrappen), from PIE *skerb-, extension of root *sker- (1) "to cut." Meaning "gather by great effort, collect with difficulty" is from 1540s. Related: Scraped; scraping. To scrape the bottom of the barrel in figurative sense is from 1942, in reference to U.S. employers facing worker shortages during the war.