Definitions of overturn:

  • noun:   an improbable and unexpected victory
  • noun:   the act of upsetting something
  • verb:   turn from an upright or normal position
    Example: "The big vase overturned"
  • verb:   cause to overturn from an upright or normal position
  • verb:   rule against
  • verb:   cause the downfall of; of rulers
  • verb:   change radically
  • verb:   annul by recalling or rescinding