Synonyms for Trim down:

n.

erode, top-slice, minimize, shrivel, halve, decrease. lose, sweat off, fatten up, fat camp, plump out, put on, stay off, fill out. trim down (noun)
cut down, bring down, trim, trim back, cut back, cut, reduce.

Other synonyms:

fatten up, top-slice, shrivel, fat camp, plump out, erode. sweat off, fill out, minimize, decrease. halve, stay off. lose. put on.