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умельчать v stresses
Gruzovik	make small; make smaller; comminute (make small or fine; reduce to minute particles or to a fine powder by breaking, pounding, braying, rasping, grinding, or pulverizing); reduce to minute particles
inf.	comminute; reduce to minute particles; make smaller
Makarov.	make fine; make finer
умельчаться v
Gruzovik	become small; become smaller
inf.	comminute; make small; reduce to minute particles; make smaller