An Etymological Dictionary of the German Language/Annotated/Zügel
Zügel, masculine, ‘rein, bridle, check,’ from Middle High German zügel, zugel, masculine, ‘strap, band, rein,’ Old High German zugil, zuhil (zuol), masculine, ‘band, cord, rein’; a derivative of ziehen. Corresponding to Old Icelandic tygell, masculine, ‘strap, cord, rein,’ Anglo-Saxon tygel, Dutch teugel, Danish tøile. See also Zaum.