An Etymological Dictionary of the German Language/Annotated/trödeln
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trödeln, verb, ‘to deal in second-hand goods, dawdle, loiter,’ from Middle High German *tretelen, which, with the nasalised form trendeln, is derived from the same root. Compare Middle High German tredel-, trendelmarket, equivalent to Modern High German Trödelmarkt, ‘rag-fair.’