WordNet (r) 3.0 (2006):

clear out
    v 1: move out and leave nothing behind
    2: clear out the chest and lungs; "This drug expectorates
       quickly" [syn: expectorate, clear out, drive out]
    3: empty completely; "We cleaned out all the drawers" [syn:
       clean out, clear out]

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "clear out":
   abscond, absquatulate, abstract, be off, beat a retreat, beat it,
   begone, bleach, blow, blow out, bolt, bowdlerize, cast off,
   cast out, chuck, clean, clean out, clean up, cleanse, clear,
   clear away, clear off, clear the decks, cut and run, cut out,
   decamp, defecate, delouse, depart, deplete, deport, depurate,
   desert, deterge, dispose of, drain, dry-clean, dust, dust off,
   eject, elide, eliminate, elope, empty, empty out, eradicate,
   evacuate, exhaust, exile, expatriate, expel, expurgate, flake off,
   flee, fly, freshen, fugitate, get, get going, get lost, get out,
   get quit of, get rid of, get shut of, git, go AWOL, hightail,
   hit the road, jump, jump bail, kite, levant, liquidate, lustrate,
   make off, make yourself scarce, outlaw, pick out, purge, purify,
   reform, remove, root out, root up, run, run away, run away from,
   run away with, run for it, run off, scavenge, scour out, scram,
   shove off, show the heels, skedaddle, skip, skip out,
   slip the cable, spruce, steam-clean, strike off, strike out,
   sweep out, sweeten, take French leave, take flight, take off,
   take to flight, take wing, throw over, throw overboard, tidy,
   turn tail, unclog, unfoul, vamoose, vent, void, weed out, whiten,
   wipe, wipe off, wipe out, wipe up