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