WordWeb Online

1. Turn from an upright or normal position
   "The big vase overturned"
   - turn over, tip over, tump over
    
2. Cause to overturn from an upright or normal position
   - tip over, turn over, upset, knock over, bowl over, tump over
    
3. Rule against
   - overrule, override, overthrow, reverse
    
4. Cause the downfall of; of rulers
   - overthrow, subvert, bring down
    
5. Cancel officially
   - revoke, annul, lift, countermand, reverse, repeal, rescind, vacate
    
6. Change radically
   - revolutionize, revolutionise [Brit]

1. The act of upsetting something
   - upset, turnover
    
2. An improbable and unexpected victory
   - upset

Derived forms: overturns, overturning, overturned

Type of: alter, cancel, change, decree, depose, displace, force out, inversion, modify, move, rule, strike down, success, turn, upending