revert

Concise Oxford English Dictionary © 2008 Oxford University Press:
revert/rɪˈvɜːt/

▶verb (revert to)

• 1 return to (a previous state, condition, etc.).

  ■ Biology return to (a former or ancestral type).

• 2 Law (of property) return or pass to by reversion.

• 3 archaic turn (one's eyes or steps) back.

– derivatives
revertant noun & adjective (Biology),
reverter noun (Law).

– origin ME: from OFr. revertir or L. revertere ‘turn back’.