topple topple /ˈtɑːpəl/

verb

1. () Fall down, as if collapsing  ( topple , tumble )
   fall down, as if collapsing
    The tower of the World Trade Center tumbled after the plane hit it
   The tower of the World Trade Center tumbled after the plane hit it
   
2. Cause to topple or tumble by pushing  ( tip , topple , tumble )
   cause to topple or tumble by pushing