overturn (http://definr.com/overturn)

     n 1: the act of upsetting something; "he was badly bruised by the
          upset of his sled at a high speed" [syn: upset, turnover]
     2: an improbable and unexpected victory; "the biggest upset
        since David beat Goliath" [syn: upset]
     v 1: turn from an upright or normal position; "The big vase
          overturned" [syn: turn over, tip over]
     2: cause to overturn from an upright or normal position; "The
        cat knocked over the flower vase"; "the clumsy customer
        turned over the vase" [syn: tip over, turn over, upset,
         knock over, bowl over]
     3: rule against; "The Republicans were overruled when the House
        voted on the bill" [syn: overrule, override, overthrow,
     4: cause the downfall of; of rulers; "The Czar was overthrown";
        "subvert the ruling class" [syn: overthrow, subvert, {bring
     5: annul by recalling or rescinding; "He revoked the ban on
        smoking"; "lift an embargo"; "vacate a death sentence"
        [syn: revoke, annul, lift, countermand, reverse,
         repeal, rescind, vacate]
     6: change radically; "E-mail revolutionized communication in
        academe" [syn: revolutionize, revolutionise]