An Etymological Dictionary of the German Language/Annotated/trendeln
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trendeln, trenteln, verb, ‘to dawdle, loiter,’ literally ‘to turn, move this way and that,’ from late Middle High German tręndeln, ‘to turn,’ allied to Middle High German tręndel, ‘ball, top,’ which, like Anglo-Saxon tręndel, ‘sphere’ (English trendle), and Dutch omtrent, ‘towards, on, about’ (Danish and Swedish trind, ‘round’), are connected with a root trend, ‘to move in a circle.’