The Collaborative International Dictionary
Disacknowledge
Disacknowledge \Dis`ac*knowl"edge\, v. t. [imp. & p. p.
Disacknowledged; p. pr. & vb. n. Disacknowledging.]
To refuse to acknowledge; to deny; to disown. [Obs.]
--South.
Wiktionary
disacknowledge
vb. (context transitive English) To refuse to acknowledge or recognize something; to disavow or deny.