rollback

詳細解釋：

roll.back

n.（名詞）
A reduction, especially in prices or wages, to a previous lower level by governmental action or direction:
回落，削減：尤指物價或工資由於政府採取行動或命令而下降到原先較低的水平：
例句：
a price rollback; a rollback of military supplies.
物價的回落；軍用物資的削減

A turning back or retreat, as from a previously held position or policy:
退後：如從原先占據的位置或政策中退卻：
例句：
Conservatives hoped for a rollback of left-wing support for the controversial new legislation.
保守派希望左派能撤回他們對有爭議的新立法的支持