An Etymological Dictionary of the German Language/schlappen
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schlappen, vb., ‘to slap, hang down, go slipshod,’ ModHG. only, from LG. and Du. slabben; see schlabbern.
schlappen, vb., ‘to slap, hang down, go slipshod,’ ModHG. only, from LG. and Du. slabben; see schlabbern.