1.  fall away(v = verb.change) drop away, drop off, slip - get worse; "My grades are slipping"
is one way to decline, worsen
Sample sentences: Something ----s; Somebody ----s

2.  fall away(v = verb.change) fall off - diminish in size or intensity;
is one way to disappear, go away, vanish
Sample sentences: Something ----s

VB  decrease, diminish, lessen, abridge, shrink, drop off, fall off, tail off, fall away, waste, wear, wane, ebb, decline, descend, subside, melt away, die away, retire into the shade, hide its diminished head, fall to a low ebb, run low, languish, decay, crumble, bate, abate, dequantitate, discount, depreciate, extenuate, lower, weaken, attenuate, fritter away, mitigate, dwarf, throw into the shade, reduce, shorten, subtract.

VB  become small, become smaller, lessen, decrease, grow less, dwindle, shrink, contract, narrow, shrivel, collapse, wither, lose flesh, wizen, fall away, waste, wane, ebb, decay, be smaller than, fall short of, not come up to, render smaller, lessen, diminish, contract, draw in, narrow, coarctate, boil down, constrict, constringe, condense, compress, squeeze, corrugate, crimp, crunch, crush, crumple up, warp, purse up, pack, squeeze, stow, pinch, tighten, strangle, cramp, dwarf, bedwarf, shorten, circumscribe, restrain, (subtraction) 38 abrade, pare, reduce, attenuate, rub down, scrape, file, file down, grind, grind down, chip, shave, shear, wear down.

away, away game, back away, barter away, bear away, beaver away, blaze away, blink away, break away, breaking away, carried away, carry away, cart away, cast away, chase away, chip away, chip away at, clear away, come away, cut away, die away, do away with, draw away, dribble away, drift away, drive away, drop away, dwindle away, dwindling away, eat away, eating away, ebb away, fade away, fading away, fall, fall all over, fall apart, fall armyworm, fall asleep, fall back, fall behind, fall by the wayside, fall cankerworm, fall dandelion, fall down, fall equinox, fall flat, fall for, fall from grace, fall guy, fall in, fall in line, fall in love, fall in with, fall into, fall into place, fall of man, fall off, fall open, fall out, fall over, fall over backwards, fall short, fall short of, fall through, fall to, fall to pieces, fall under, fall upon, fall webworm, far and away, file away, flow away, fool away, free fall, frighten away, fritter away, frivol away, get away, get away with, give away, go away, going away, grind away, hammer away at, haul away, have it away, hive away, home away from home, keep away, laugh away, lay away, lock away, look away, melt away, move away, out and away, pack away, pass away, peg away, piddle away, pine away, piss away, plug away, pound away, pull away, push away, put away, rationalise away, rationalize away, ride away, right away, run away, running away, rush away, salt away, scare away, send away, shoo away, shut away, shy away from, sign away, slip away, sneak away, sock away, spirit away, square away, squirrel away, stack away, stash away, stay away, steal away, stow away, sweep away, take away, taking away, tear away, throw away, throwing away, toss away, trifle away, tuck away, turn away, turn away from, turning away, walk away, wanton away, wash away, waste away, wasting away, wear away, wearing away, while away, while away the time, whisk away, whittle away, wipe away, worn away, yack away, yap away