An Etymological Dictionary of the German Language/Annotated/reffen
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reffen, verb, ‘to hatchel hemp or flax,’ from Middle High German reffen (a variant of raffen), ‘to tug, pluck.’ The Modern High German sense is probably based on a Low German word. Compare Dutch repel, ‘breaking flax,’ repelen, ‘to break flax,’ English ripple, ‘hatchel.’