roll back
To change something back to the way it was before — usually a rule, price, or plan.
Meanings
To reduce prices to a lower level, especially as a promotion.
"The supermarket rolled back the prices on hundreds of items to attract more shoppers."
"Rollback. That's our goal."
— Walmart advertising slogan (1990s–2000s), associated with the 'Rollback' pricing campaign
To reverse, repeal, or undo a law, policy, or social progress.
"The new government threatened to roll back environmental protections put in place over the previous decade."
To move backward by rolling, especially a vehicle.
"Make sure you put the handbrake on — the car will roll back on this hill."
To push back an enemy or opposing force to a previous position.
"The troops managed to roll back the enemy advance overnight."
Very common in political and business journalism. 'Roll back prices' is a famous phrase associated with Walmart's advertising in the US. In computing, 'rollback' (one word, noun) refers to reverting to a previous version of a database or system. The intransitive physical use (a vehicle rolling backwards) is more literal and less common.
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