To reduce the cost of a process, or the amount spent on something.
Scale-down Sentence Examples
You can use the Computer of the Gods to scale down the solar system so that it is in bite size chunks.
They are also trying to get Shanks to scale down the tonnage of waste.
Keep in mind that hoarders don't completely recover, but they may be able to scale down their level of collecting to the point that it doesn't negatively affect their life as much as it did before treatment.