An Etymological Dictionary of the German Language/Kuppeln
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Kuppeln, vb., ‘to couple, fence (a field),’ from MidHG. kuppeln, koppeln, ‘to leash, bind, fetter, unite’; MidHG. kuppelspil, ‘coupling,’ kuppelœre, ‘match-maker, procurer,’ and kuppelœrinne, the fem. form; a deriv. of Koppel, Lat. copulare.