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Debacle

n.
  1. (Geol.) A breaking or bursting forth; a violent rush or flood of waters which breaks down opposing barriers, and hurls forward and disperses blocks of stone and other débris.
  2. A sudden breaking up or breaking loose; a violent dispersion or disruption; impetuous rush; outburst.
  3. a complete and ludicrous failure; a rout, as of an army; a great disaster; a fiasco.