upset, overturn, turnover -- (the act of upsetting something; "he was badly bruised by the upset of his sled at a high speed")
overturn, upset -- (an improbable and unexpected victory; "the biggest upset since David beat Goliath")
Overview of verb overturn
The verb overturn has 6 senses
overturn, turn over, tip over, tump over -- (turn from an upright or normal position; "The big vase overturned"; "The canoe tumped over")
overturn, 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")
overrule, overturn, override, overthrow, reverse -- (rule against; "The Republicans were overruled when the House voted on the bill")
overthrow, subvert, overturn, bring down -- (cause the downfall of; of rulers; "The Czar was overthrown"; "subvert the ruling class")