disclaim
/dɪsˈkleim; dɪs`klem/ v[Tn, Tg]
say that one does not have (sth); renounce 声称没有（某事物）; 否认; 放弃
The gang disclaimed all responsibility for the explosion, ie said they did not cause it. 这个匪帮声称与这次爆炸事件毫无关系.
She disclaimed ownership of the vehicle. 她放弃了这辆车的所有权.