Webster's English Dictionary

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disavow

dis.avow \.dis-*-'vau.\ \-'vau.(-*)l\ vt [ME desavowen, fr. MF desavouer, 
   fr. OF, fr. des- dis- + a]vouer to avow : to refuse to acknowledge : deny 
   responsibility for : REPUDIATEM - dis.avow.al n