revert to

1 :  to go back or return to (an earlier state, condition, situation, etc.) She has reverted (back) to her old habits. My blood pressure has reverted to normal. After playing badly in the last two games, he seems to have reverted to (is previous) form.

2 law, of property :  to be given to (a former owner or a former owner's heir) The estate reverted to a distant cousin.