Disacknowledge

[imp. & p. p. Disacknowledged ; p. pr. & vb. n. Disacknowledging.]
To refuse to acknowledge; to deny; to disown. [Obs.] South.

verb

To refuse to recognize or acknowledge: deny, disavow, disclaim, disown, reject, renounce, repudiate. Idioms: turn one's back on. See accept/reject.