If you disown someone or something, you say or show that you no longer want to have any connection with them or any responsibility for them. The man who murdered the girl is no son of mine. I disown him. to say that you no longer want to be connected with someone or something, especially a member of your family or something that you are responsible for
To refuse to own or acknowledge as belonging to one's self; to disavow or deny, as connected with one's self personally; as, a parent can hardly disown his child; an author will sometimes disown his writings