#collapse.misadventure  a mishap caused by something suddenly falling down or caving in
  supertype:  #misadventure__mishap__mischance  an instance of misfortune
  subtype:  #cave_in__subsidence  the sudden collapse of something into a hollow beneath it
  subtype:  #fiasco__debacle  a sudden and violent collapse
  subtype:  #implosion.collapse  a sudden inward collapse; "the implosion of a light bulb"
     subtype:  #gravitational_collapse__gravitationalcollapse  the implosion of a star resulting from its own gravity; the result is a smaller and denser celestial object

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