emergency
noun
iˈmɜːdʒənsi 
iˈmɜːrdʒənsi a sudden serious and dangerous event or situation which needs immediate action to deal with it
The government has declared a state of emergency following the earthquake.This door should only be used in an emergency.the emergency exit (= to be used in an emergency)The government had to take emergency action.The pilot made an emergency landing in a field.I always have some extra cash with me for emergencies.The government has been granted emergency powers (= to deal with an emergency).