rollback

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++roll·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 〔税收、价格等的〕回调，回落；〔法律的〕回复，恢复 → 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.

roll·back nounChineseSyllable  

tax, occasion etc when an law a Business Corpus price,

rollback
roll‧back /ˈrəʊlbæk $ ˈroʊl-/ noun [uncountable and countable] 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

roll·backBrE /ˈrəʊlbæk/ 🔊NAmE /ˈroʊlbæk/ 🔊 noun [singular, uncountable] (especially NAmE) a reduction in a price or in pay, to a past level （价格或工资等的）下跌，回落the act of changing a situation, law, etc. back to what it was before （情形、法律等的）回复，恢复