%disavow%

v. t. [ imp. & p. p. Disavowed p. pr. & vb. n. Disavowing. ] [ F. désavouer; pref. dés- (L. dis-) + avouer to avow. See Avow, and cf. Disavouch. ] 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. [ 1913 Webster ]

A solemn promise made and disavowed. Dryden. [ 1913 Webster ]

2. To deny; to show the contrary of; to disprove. [ 1913 Webster ]

Yet can they never
Toss into air the freedom of my birth,
Or disavow my blood Plantagenet's. Ford. [ 1913 Webster ]