den·i·grate /ˈdɛnɪˌgret/
  (vt.)使變黑,玷汙,詆毀
  Den·i·grate v. t.
  1. To blacken thoroughly; to make very black.
  2. Fig.: To blacken or sully; to defame. [R.]
     To denigrate the memory of Voltaire.    --Morley.
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  denigrate
       v 1: belittle; "Don't belittle his influence" [syn: minimize, belittle,
             derogate]
       2: charge falsely or with malicious intent; attack the good
          name and reputation of someone; "The journalists have
          defamed me!" "The article in the paper sullied my
          reputation" [syn: defame, slander, smirch, asperse,
           calumniate, smear, sully, besmirch]