apoc·a·lypse 
/əˈpɑ:kəˌlɪps/ noun
/əˈpɑ:kəˌlɪps/ noun [singular] : a great disaster : a sudden and very bad event that causes much fear, loss, or destruction
▪ His book tells of an environmental apocalypse. ▪ fears of a nuclear apocalypse [=a disaster caused by nuclear weapons]
▪ His book tells of an environmental apocalypse. ▪ fears of a nuclear apocalypse [=a disaster caused by nuclear weapons]
the apocalypse
: the end or destruction of the world especially as described in the Christian Bible
▪ Some people believed the apocalypse would happen in the year 2000. ▪ waiting for the apocalypse
▪ Some people believed the apocalypse would happen in the year 2000. ▪ waiting for the apocalypse
