[1] : WordNet (r) 2.0

run down
     v 1: trace; "we are running down a few tips" syn: check out
     2: move downward; "the water ran down"
     3: injure or kill by running over, as with a vehicle syn: run
        over
     4: use up all one's strength and energy and stop working; "at
        the end of the march, i pooped out" syn: poop out, peter
        out, run out, conk out
     5: examine hastily; "she scanned the newspaper headlines while
        waiting for the taxi" syn: scan, skim, rake, glance
        over
     6: deplete; "exhaust one's savings"; "we quickly played out our
        strength" syn: exhaust, play out, sap, tire
     7: pursue until captured; "they ran down the fugitive"
see also:
check out run over poop out peter out run out conk out 
scan skim rake glance over exhaust 
play out sap tire 

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

256 moby thesaurus words for "run down":
   abandoned, ausgespielt, battered, beat-up, beaten up, belittle,
   blow, break down, bring down, bring into discredit, bring low,
   broken-down, burn out, burned-out, cachectic, calm, calm down,
   cease, collapse, collide, crack up, cry down, debase, debilitated,
   decline, decrepit, decry, degrade, depreciate, derelict, derogate,
   derogate from, deserted, desolate, determine, detract from,
   devitalized, die, die down, dilapidated, diminish, dingy, disabled,
   disapprove of, discover, discredit, disgrace, disparage, dispraise,
   done, done up, down-at-heel, drained, droop, drooping, droopy,
   drop, dwindle, ebb, effete, emptied, enervated, enfeebled,
   eviscerated, exhausted, fade, fagged, fail, failing, faint,
   fainting, fall, fall aboard, fall away, fall off, far-gone,
   fatigue, fatigued, feeble, feeling faint, find, find out, flag,
   flagging, follow, follow a clue, follow up, footsore, forsaken,
   frail, frazzled, gasp, get, get tired, give out, go down,
   go downhill, go off, good and tired, grow weary, halt, head into,
   healthless, hit, hit a slump, hit and run, hit rock bottom,
   hit the skids, hold in contempt, hunt down, in poor health,
   in ruins, incapacitated, infirm, inundate, invalid, invent, jade,
   jaded, knock, laid low, languid, languish, languishing, lapse,
   locate, lose strength, lull, make little of, minimize, molder,
   moribund, nose, nose out, overflow, override, overrun, pacify,
   pale, pant, peak, peaked, peaky, peter out, pine, play out,
   played out, poop out, pooped, puff, puff and blow, put down,
   quiesce, quiet, quieten, ram, ramshackle, reach the depths,
   ready to drop, rediscover, reduced, reduced in health,
   reflect discredit upon, ride down, ride over, ride roughshod over,
   ruined, ruinous, run broadside on, run in, run into, run out,
   run over, run ragged, run to earth, sagging, sail into, sapped,
   seedy, shabby, shadow, shotten, sickly, sink, slide, slight, slip,
   slummy, slump, smell out, sniff out, soothe, speak ill of, spent,
   stalk, stop, strike, submit to indignity, subside, succumb, tacky,
   tail, tattered, tire, tired, tired-winged, toilworn, tottery,
   touch bottom, trace, trace down, track, track down, trail, trample,
   trample on, trample underfoot, trample upon, tranquilize,
   tread upon, tumbledown, uncared-for, unhealthy, unrefreshed,
   unrestored, unsound, untended, used up, valetudinarian,
   valetudinary, wane, waste, waste away, wasted, way-weary, wayworn,
   weak, weaken, weakened, weakly, wearied, weariful, weary,
   weary-footed, weary-laden, weary-winged, weary-worn, wheeze, wilt,
   wilting, with low resistance, wither, wither away, worn, worn-down,
   worn-out

Break Down >> B Words
Break Down, definition of term: Break Down
break+down_pag1.html

Bring Down >> B Words
Bring Down, definition of term: Bring Down
bring+down_pag1.html

Bow Down >> B Words
Bow Down, definition of term: Bow Down
bow+down_pag1.html

Boil Down >> B Words
Boil Down, definition of term: Boil Down
boil+down_pag1.html

Belt Down >> B Words
Belt Down, definition of term: Belt Down
belt+down_pag1.html

Back Down >> B Words
Back Down, definition of term: Back Down
back+down_pag1.html