revert

intransitive verb | \ ri-ˈvərt \ | re·vert

1. : to come or go back (as to a former status or state) if the donee of a general power fails to exercise it…the appointive assets revert to the donor's estate —W. M. McGovern, Jr. et al.

2. : to return to the grantor or his or her heirs as a reversion