v. 25B6; verb
they blackened their faces : BLACK, darken; dirty, make sooty, make smoky, stain, grime, soil.
the sky blackened : GROW/BECOME BLACK, darken, dim, grow dim, cloud over.
someone has blackened my name : SULLY, tarnish, besmirch, drag through the mud/mire, stain, taint, smear, disgrace, dishonour, bring discredit to, damage, ruin; slander, defame.
whiten, clean, lighten, brighten, clear.