From Longman Dictionary of Contemporary Englishrollbackroll‧back /ˈrəʊlbæk $ ˈroʊl-/ noun [countable, uncountable] especially American English an occasion when a tax, price, law etc is reduced to a previous level or changed so that it is the way it used to be → roll back at roll1
Examples from the Corpus
rollback• That resolution demands a rollback in utility rates and a scaling back of the market-oriented economic policies imposed by Bucaram.• The vote set the stage for a government-wide review and partial rollback of affirmative action programs.• The gas tax rollback, initiated because gasoline prices spiked this spring, has since fallen by the wayside.From Longman Business Dictionaryrollbackroll‧back /ˈrəʊlbækˈroʊl-/ noun [countable]ECONOMICS when prices, taxes etc are changed back to a previous levelThe President is opposed to a rollback in Social Security taxes. 