Source : WordNet®

tip over
     v 1: 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" [syn: {overturn},
           {turn over}, {upset}, {knock over}, {bowl over}, {tump
          over}]
     2: turn from an upright or normal position; "The big vase
        overturned"; "The canoe tumped over" [syn: {overturn}, {turn
        over}, {tump over}]