crash, shed, sag, slack off, slacken, pop, lower, dive, slip, spiral, crumple, subside, collapse, sink, plummet, deteriorate, crumble, tumble, fall, fail, tank, bottom out, decline, depreciate, plunge, flag, drop (off), submerge, ease off, let fall, yield (to stronger forces), lack (vitality), give way, cave (in), free-fall, careen, nose-dive, decrease, dwindle, cut down, take a cut

sever, hollow out, trisect, shave off, snip, clip, trim, break off, crush, scrunch, pinch, contract, split, carve, whittle, chisel, remove, quarter, shrink, puncture, thin, hack off, reduce, narrow, divide, lag, purge, consume, deflate, tear down/apart, shear off, slice off, decrease, shorten, dwarf, prune, condense, diminish, stunt, subdivide, miniaturize, chip away at, knock off, halve, chip off, empty (contents), lighten (weight of load), bisect, wear away/down