WordWeb Online

1. Having been turned so that the bottom is no longer the bottom
   "an overturned car"
   - upset, upturned

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
   "the clumsy customer overturned the vase"
   - tip over, turn over, upset, knock over, bowl over, tump over
    
3. Rule against
   "The Republicans were overturned when the House voted on the bill"
   - overrule, override, overthrow, reverse
    
4. Cause the downfall of; of rulers
   "overturn the ruling class"
   - overthrow, subvert, bring down
    
5. Cancel officially
   "He overturned the ban on smoking"
   - revoke, annul, lift, countermand, reverse, repeal, rescind, vacate
    
6. Change radically
   - revolutionize, revolutionise [Brit]

See also: turned

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