[1] : WordNet (r) 2.0

die away
     v : become less in amount or intensity; "the storm abated"; "the
         rain let up after a few hours" syn: abate, let up, slack
         off, slack
see also:
abate let up slack off slack 

[2] : Moby Thesaurus II by Grady Ward, 1.0

108 moby thesaurus words for "die away":
   abate, ablate, bate, be all over, be annihilated, be consumed,
   be destroyed, be eaten away, be gone, be no more, be wiped out,
   become extinct, become void, blow over, burn out, cease,
   cease to be, cease to exist, consume, consume away, corrode,
   crumble, decline, decrease, deliquesce, dematerialize, depart, die,
   die out, diminish, disappear, dispel, disperse, dissipate,
   dissolve, dive, do a fade-out, drift away, drop, drop off, dwindle,
   ebb, erode, evanesce, evaporate, exit, expire, fade, fade away,
   fade out, fall, fall away, fall off, fizzle, fizzle out, flame out,
   flee, fly, go, go away, go out, have it, have its time, hide,
   languish, lapse, leave no trace, leave the scene, lessen, let up,
   melt, melt away, move away, move off, pass, pass away, pass out,
   perish, peter out, plummet, plunge, pull away, recede, retire,
   retire from sight, retreat, retrocede, run its course, run low,
   run out, sag, shrink, sink, sink away, stand off, subside,
   suffer an eclipse, tail off, vanish, vanish from sight, wane,
   waste, waste away, wear, wear away, wear off, widen the distance,
   withdraw

Away >> A Words
Away, definition of term: Away
away_pag1.html

Break Away >> B Words
Break Away, definition of term: Break Away
break+away_pag1.html

Blow Away >> B Words
Blow Away, definition of term: Blow Away
blow+away_pag1.html