Princeton's WordNet

1. upset, overturn, turnover(noun)

   the act of upsetting something

   "he was badly bruised by the upset of his sled at a high speed"

2. overturn, upset(verb)

   an improbable and unexpected victory

   "the biggest upset since David beat Goliath"

3. overturn, turn over, tip over, tump over(verb)

   turn from an upright or normal position

   "The big vase overturned"; "The canoe tumped over"

4. overturn, tip over, turn over, upset, knock over, bowl over, tump over(verb)

   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"

5. overrule, overturn, override, overthrow, reverse(verb)

   rule against

   "The Republicans were overruled when the House voted on the bill"

6. overthrow, subvert, overturn, bring down(verb)

   cause the downfall of; of rulers

   "The Czar was overthrown"; "subvert the ruling class"

7. revoke, annul, lift, countermand, reverse, repeal, overturn, rescind, vacate(verb)

   cancel officially

   "He revoked the ban on smoking"; "lift an embargo"; "vacate a death sentence"

8. revolutionize, revolutionise, overturn(verb)

   change radically

   "E-mail revolutionized communication in academe"

Kernerman English Learner's Dictionary

1. overturn(verb)ˈoʊvɚtˌɝn

   to turn sth so that the side facing down now faces up

   He hit another car and overturned his truck.

2. overturnˈoʊvɚtˌɝn

   (of a court) to change a decision made by a less important court

   The appeals court overturned the earlier decision.

Wiktionary

1. overturn(Verb)

   To turn over, capsize or upset (something)

2. overturn(Verb)

   To overthrow or destroy something

3. overturn(Verb)

   To reverse a decision; to overrule or rescind

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