IPA: /ˈroʊlˌbæk/
KK: /ˈroʊlˌbæk/
A decrease in something, like prices or wages, to a previous lower level, often done by government action.
The government announced a rollback of taxes to help citizens during the economic crisis.
Rollback → It is formed from "roll" (from Old English "rollian", meaning to turn over or rotate) and "back" (meaning in the opposite direction). The word "rollback" refers to the action of turning something back to a previous state or position.
Think of something that is 'turned over' ('roll') and then moved 'back' to its original place — that's what rollback means.