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
Webster's English Dictionarydark.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