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WordNet (r) 3.0 (2006) (WordNet)

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