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Verb: badmouth  'bad,mawth or 'bad,mawdh
  1. Speak unfavourably about
    "She badmouths her husband everywhere";
    - malign, traduce, drag through the mud

Derived forms: badmouths, badmouthing, badmouthed

Type of: asperse, besmirch, calumniate [formal], defame, denigrate, slander, smear, smirch, sully