An Etymological Dictionary of the German Language/Annotated/schürfen
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schürfen, verb, ‘to scratch, scrape, dig,’ from Middle High German schürfen, schürpfen, ‘to cut up,’ to which schürfœre, ‘flayer, executioner,’ Old High German scurfen, ‘to cut up,’ and Anglo-Saxon scrëpan, sceorpan, are allied. Probably connected with the root skrëp, skërp, ‘to be sharp.’ See scharf, schrappen, and schröpfen.