Webster's English Dictionary

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darken

dark.en \'da:r-k*n\ \'da:rk-(*-)nin\ \'da:rk-(*-)n*r\ vb or dark.en.ing : 
   to grow dark : become obscured  1: to make dark  2: to make less clear : 
   OBSCURE  3: TAINT, TARNISH  4: to cast a gloom over  5: to make of darker 
   color  - dark.en.er n