An Etymological Dictionary of the German Language/Grempelmarkt
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Grempelmarkt, m., ‘frippery, rag-fair,’ allied to MidHG. grempeler, ‘slop-seller, retailer,’ grempen, ‘to keep a retail shop, deal in second-hand goods’; the latter is akin to Ital. comprare (with r transposed crompare), ‘to buy,’ compra, ‘purchase.’