To renounce all claim to; to deny ownership of or responsibility for; to disown; to disavow; to reject
I was to say that Maw and Meggins disclaim all responsibility, continued the other. They admit no liability at all, but in consideration of your son's services they wish to present you with a certain sum as compensation..
If you disclaim knowledge of something or disclaim responsibility for something, you say that you did not know about it or are not responsible for it. She disclaims any knowledge of her husband's business. = deny. to state, especially officially, that you are not responsible for something, that you do not know about it, or that you are not involved with it = deny disclaim responsibility/knowledge etc