The Collaborative International Dictionary of English v.0.48:

Subvert \Sub*vert"\, v. i.
   To overthrow anything from the foundation; to be subversive.
   [1913 Webster]

         They have a power given to them like that of the evil
         principle, to subvert and destroy.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Subvert \Sub*vert"\, v. t. [imp. & p. p. Subverted; p. pr. &
   vb. n. Subverting.] [L. subvertere, subversum; sub under +
   vertere to turn: cf. F. subvertir. See Verse.]
   1. To overturn from the foundation; to overthrow; to ruin
      utterly.
      [1913 Webster]

            These are his substance, sinews, arms, and strength,
            With which he yoketh your rebellious necks,
            Razeth your cities, and subverts your towns. --Shak.
      [1913 Webster]

            This would subvert the principles of all knowledge.
                                                  --Locke.
      [1913 Webster]

   2. To pervert, as the mind, and turn it from the truth; to
      corrupt; to confound. --2 Tim. iii. 14.
      [1913 Webster]

   Syn: To overturn; overthrow; destroy; invert; reverse;
        extinguish.
        [1913 Webster]

WordNet (r) 3.0 (2006):

subvert
    v 1: cause the downfall of; of rulers; "The Czar was
         overthrown"; "subvert the ruling class" [syn: overthrow,
         subvert, overturn, bring down]
    2: corrupt morally or by intemperance or sensuality; "debauch
       the young people with wine and women"; "Socrates was accused
       of corrupting young men"; "Do school counselors subvert young
       children?"; "corrupt the morals" [syn: corrupt, pervert,
       subvert, demoralize, demoralise, debauch, debase,
       profane, vitiate, deprave, misdirect]
    3: destroy property or hinder normal operations; "The Resistance
       sabotaged railroad operations during the war" [syn:
       sabotage, undermine, countermine, counteract,
       subvert, weaken]
    4: destroy completely; "we must not let our civil liberties be
       subverted by the current crisis"

Moby Thesaurus II by Grady Ward, 1.0:

129 Moby Thesaurus words for "subvert":
   accommodate, adapt, adjust, alienate, alter, ameliorate, answer,
   answer conclusively, argue down, arise, better, brainwash,
   break up, capsize, careen, change, confound, confute, contradict,
   controvert, convert, corrupt, counterindoctrinate, crush, culbuter,
   debase, defeat, deform, demolish, denature, deny, deprave, destroy,
   dismiss, dispose of, diversify, finish, fit, floor, honeycomb,
   improve, indoctrinate, insurge, insurrect, keel over, meliorate,
   mitigate, modify, modulate, mount the barricades, mutate, mutineer,
   mutiny, nonplus, overset, overthrow, overturn, overwhelm, parry,
   pervert, put to silence, qualify, re-create, realign, rebel,
   rebuild, rebut, reconstruct, redesign, reduce to silence, refit,
   reform, refute, reindoctrinate, reluct, reluctate, remake, renew,
   reshape, restructure, revamp, revive, revolt, revolute, revolution,
   revolutionize, ring the changes, riot, rise, rise up, ruin,
   run riot, sabotage, sap, sap the foundations, settle,
   shift the scene, shuffle the cards, shut up, silence,
   smash all opposition, squash, squelch, strike, throw down,
   throw over, tip over, topple, topple over, topsy-turvify,
   topsy-turvy, turn a somersault, turn over, turn the scale,
   turn the tables, turn the tide, turn topsy-turvy, turn turtle,
   turn upside down, undermine, upend, upset, upturn, vary, weaken,
   win away, work a change, worsen, wreck