An Etymological Dictionary of the German Language/lösen

by Friedrich Kluge

lösen, vb., ‘to loosen, free,’ from the equiv. MidHG. lœsen, OHG. lôsen (*lôsjan); a derivative of the MidHG. and OHG. adj. lôs (see los); comp. Goth. lausjan, ‘to loosen,’ from laus, ‘loose.’