Blacken

(blăk'n), v. t. [imp. & p. p. BLACKENED; p. pr. & vb. n. BLACKENING.] [See BLACK, v. t.]

1. To make or render black. While the long funerals blacken all the way. Pope.
2. To make dark; to darken; to cloud. “Blackened the whole heavens.” South.
3. To sully, as reputation; to make infamous; as, vice blackens the character. “To blacken and discredit in every way all those who did not hold to their faction.” Burke.