verb (v)

• refuse to acknowledge; disclaim knowledge of; responsibility for, or association with(verb.communication)

  Example:
  Her husband disavowed her after 30 years of marriage and six children.
  

  Antonym:
  avouch, avow
  

  source: wordnet30
• To refuse strongly and solemnly to own or acknowledge; to deny responsibility for, approbation of, and the like; to disclaim; to disown; as, he was charged with embezzlement, but he disavows the crime.(verb)

  source: webster1913