definition of
overturn

[1] #1 overturn v. [turn over, tip over, tump over] turn from an upright or normal position; "The big vase overturned"; "The canoe tumped over". wn

[2] #2 overturn v. [tip over, turn over, upset, knock over, bowl over, tump over] 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". wn

[3] #3 overturn v. [overrule, override, overthrow, reverse] rule against; "The Republicans were overruled when the House voted on the bill". wn

[4] #4 overturn n. [upset, turnover] the act of upsetting something; "he was badly bruised by the upset of his sled at a high speed". wn

[5] #5 overturn n. [upset] an improbable and unexpected victory; "the biggest upset since David beat Goliath". wn