A rollback is a reduction in price or some other change that makes something like it was before.
例句
Silber says the tax rollback would decimate basic services for the needy...西尔伯说税收的回落可能会大大减少为贫困人口提供的基本服务。The rollback of reform is already putting off private western investors.改革开倒车已经让西方的个体投资商心生疑虑。