disaffiliate
From Longman Dictionary of Contemporary Englishdisaffiliatedis‧af‧fil‧i‧ate /ˌdɪsəˈfɪlieɪt/ verb [intransitive, transitive + from] formal MEMBER#if an organization disaffiliates from another organization or is disaffiliated from it, it breaks the official connection it has with it OPP affiliate —disaffiliation /ˌdɪsəfɪliˈeɪʃən/ noun [uncountable]→ See Verb table