WordNet (r) 3.0 (2006):

scale down
    v 1: reduce proportionally; "The model is scaled down" [ant:
         scale up]
    2: make smaller; "reduce an image" [syn: reduce, scale down]
       [ant: blow up, enlarge, magnify]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "scale down":
   abridge, compress, contract, curtail, cut, cut back, cut down,
   damp, dampen, decrease, deduct, deflate, depreciate, depress,
   diminish, downgrade, lessen, lower, minify, pare, reduce, retrench,
   roll back, shorten, simplify, step down, take from, tune down