overturn

(noun) the act of upsetting something. Synonyms: upset, turnover. Example: "He was badly bruised by the upset of his sled at a high speed."

(noun) an improbable and unexpected victory. Synonyms: upset. Example: "The biggest upset since david beat goliath."

(verb) turn from an upright or normal position. Synonyms: turn over, tip over, tump over. Examples: "The big vase overturned." "The canoe tumped over."

(verb) cause to overturn from an upright or normal position. Synonyms: tip over, turn over, upset, knock over, bowl over, tump over. Examples: "The cat knocked over the flower vase." "The clumsy customer turned over the vase." "He tumped over his beer."

(verb) rule against. Synonyms: overrule, override, overthrow, reverse. Example: "The republicans were overruled when the house voted on the bill."

(verb) cause the downfall of; of rulers. Synonyms: overthrow, subvert, bring down. Examples: "The czar was overthrown." "Subvert the ruling class."

(verb) cancel officially. Synonyms: revoke, annul, lift, countermand, reverse, repeal, rescind, vacate. Examples: "He revoked the ban on smoking." "Lift an embargo." "Vacate a death sentence."

(verb) change radically. Synonyms: revolutionize, revolutionise. Example: "E-mail revolutionized communication in academe."