"overturn" in the noun sense

1. upset, overturn, turnover

the act of upsetting something

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

2. overturn, upset

an improbable and unexpected victory

"the biggest upset since David beat Goliath"

"overturn" in the verb sense

1. overturn, turn over, tip over, tump over

turn from an upright or normal position

"The big vase overturned"

"The canoe tumped over"

2. 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"

3. overrule, overturn, override, overthrow, reverse

rule against

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

4. overthrow, subvert, overturn, bring down

cause the downfall of of rulers

"The Czar was overthrown"

"subvert the ruling class"

5. revoke, annul, lift, countermand, reverse, repeal, overturn, rescind, vacate

cancel officially

"He revoked the ban on smoking"

"lift an embargo"

"vacate a death sentence"

6. revolutionize, revolutionise, overturn

change radically

"E-mail revolutionized communication in academe"

Source: WordNet® (An amazing lexical database of English)

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