dis·avow /ˌdɪsəˈvaʊ/
  (vt.)否認,否定,抵賴
  Dis·a·vow v. t. [imp. & p. p. Disavowed p. pr. & vb. n. Disavowing.]
  1. 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.
     A solemn promise made and disavowed.   --Dryden.
  2. To deny; to show the contrary of; to disprove.
  Yet can they never
  Toss into air the freedom of my birth,
  Or disavow my blood Plantagenet's.   --Ford.
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  disavow
       v : refuse to acknowledge; disclaim knowledge of; responsibility
           for, or association with; "Her husband disavowed her
           after 30 years of marriage and six children" [ant: avow]