The phrase "to roll back" means to reverse or undo something that has already been done. It can refer to a change in policy, an action taken by a government or organization, or even personal decisions and choices. The term is often used when discussing political issues such as environmental regulations, social programs, or economic policies. In these cases, "to roll back" means to revoke or repeal the existing laws, rules, or initiatives in favor of older ones that were previously in place.