An Etymological Dictionary of the German Language/Senkel
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Senkel, m.,‘plumb-line,’ from MidHG. sęnkel, m., ‘plumb-line, lace,’ also ‘anchor, drag-net,’ OHG. sęnchil, ‘anchor, drag-net.’ Allied to senken, MidHG. sęnken, OHG. sęnchen, ‘to lower’ (factitive of sinken; comp. OSax. sęnkian, Goth. sagqjan, ‘to lower, let down’).