An Etymological Dictionary of the German Language/sacht
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sacht, adj., ‘soft, gentle, slow, gradual,’ ModHG. only (unknown to UpG.), from LG. sacht, comp. Du. zacht; LG. and Du. cht for HG. ft. It corresponds to HG. sanst, the nasal of which has disappeared even in OSax. sâfto, adv., ‘softly, gently.’