roll something ↔ back phrasal verb ( see also ↑ roll )
1 . to reduce the influence or power of a law, system, government etc:
a threat to roll back the legislation of the past 12 years
2 . especially American English to reduce a price, cost etc:
the administration’s promise to roll back taxes
⇨ ↑ rollback
3 . to force your opponents in a war to move back from their position
4 . roll back the years British English to make someone remember something from the past:
Looking at those old photos really rolled back the years.