What is the meaning of tip over?

verb

• Cause to overturn from an upright or normal position.
  • usage: "The cat knocked over the flower vase"; "the clumsy customer turned over the vase"; "he tumped over his beer"
  • synonyms: overturn, turn over, upset, knock over, bowl over, tump over
• Turn from an upright or normal position.
  • usage: "The big vase overturned"; "The canoe tumped over"
  • synonyms: overturn, turn over, tump over