Any large and disastrous event of great significance.
A disaster beyond expectations.
The dramatic event that initiates the resolution of the plot; the dénouement.
A type of bifurcation, where a system shifts between two stable states.
A situation which poses an immediate risk and which requires urgent attention.
Arising from or used in an emergency.
An individual brought in at short notice to replace a member of staff, a player in a sporting team, etc.
The department of a hospital that treats emergencies.