Synonyms for Blacken:

n.

attack. deepen. spatter, smut, bespatter, taint, stain. blacken (noun)
melanise, black, nigrify, scorch, char, melanize.

v.

blacken (verb)
obscure, darken, shadow, eclipse.
change (verb)
scorch, char.
darken (verb)
soil, dim, begrime, shade, smudge, deepen, befoul, cloud.
malign; smear (verb)
calumniate, traduce, defile, tarnish, malign, attack, stain, slander, taint, defame, dishonor, vilify, denigrate, sully, libel.
slander (verb)
sully, slander, malign, detract, libel, scandalize, tarnish, calumniate, dishonor, pillory, besmirch, badmouth, vilify, shame, denounce, stigmatize, smear, discredit, traduce, denigrate, besmear, defame.

Other synonyms:

smutch, befoul, besoil, begrime. mellow, deepen, bleed, taint, spatter. fade. gray. change. dirty
begrime, smutch, besoil.

Usage examples for blacken

  1. He would like to blacken Paul's eyes and flatten his nose. – Winning His Way by Charles Carleton Coffin
  2. The memory of Caligula will blacken with execration while time lasts, because be hung up his laws so high that people could not read them, and then punished them because they did not keep them. – The Anti-Slavery Examiner, Omnibus by American Anti-Slavery Society
  3. Most of the married women of Japan are accustomed after marriage to blacken their formerly dazzlingly white teeth, but it is to be hoped that this unpleasant custom will soon disappear, as the women of distinction have begun to abandon it. – The Voyage of the Vega round Asia and Europe, Volume I and Volume II by A.E. Nordenskieold