blacken/ˈblækən; `blækən/ v[Tn]1 make or become black or very dark 使黑; 使变黑.2 [Tn] say unpleasant things about (sth) 诋毁, 诽谤（某事物） blacken a person's character/name 诋毁某人的品格[名声].
牛津英汉双解词典