An Etymological Dictionary of the German Language/schrappen
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schrappen, vb., ‘to scrape,’ ModHG. only, from LG. schrappen, an intensive form of Du. schrapen, schrabben, ‘to scratch,’ MidE. scrapien (schrapien), E. to scrape, OIc. skrapa. From the LG. cognates OFr. escraper, ‘to scratch off,’ is derived. See further under schröpfen and schrubben.