If you scale down something, you make it smaller in size, amount, or extent than it used to be.
One factory has had to scale down its workforce from six hundred to only six. [VERB PARTICLE noun]
The air rescue operation has now been scaled down. [VERB PARTICLE noun (not pronoun)]
The Romanian government yesterday unveiled a new, scaled-down security force. [VERB-ed PARTICLE]
[Also
VERB noun
PARTICLE]