debacle

noun2

1. •
   An event or enterprise that ends suddenly and disastrously, often with humiliating consequences.

   • The event proved to be a great debacle for the partisans of this prognosticator. — 1952
2. •
   A breaking up of a natural dam, usually made of ice, by a river and the ensuing rush of water.

   • […] so that in extreme cases the latter may even be dammed up for a time, and a debacle be the consequence, when the main river overcomes the resistance opposed to it, […] — 1836