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Emergency (Noun)

A brake operated by hand; usually operates by mechanical linkage.

Nouns denoting man-made objects.

The emergency brake in the train was pulled, bringing all the carriages to a halt.
In an emergency, the hand brake could be applied to slow down the locomotive.
The engineer ensured the emergency brake was fully engaged before exiting the train.
The driver struggled to activate the emergency brake as the vehicle began rolling down the hill.
The operator applied the emergency brake to avoid a collision between the two trains.

A sudden unforeseen crisis (usually involving danger) that requires immediate action; "he never knew what to do in an emergency".

Nouns denoting natural events.

The hospital staff sprang into action during the emergency, rushing to treat the injured patients.
In the event of an emergency, call the toll-free number displayed on the screen.
She panicked during the emergency and forgot the fire evacuation procedure.
The emergency alarm sounded, signaling a potential gas leak in the building.
All passengers were instructed on emergency procedures, including how to use the flotation devices.

A state in which martial law applies; "the governor declared a state of emergency".

Nouns denoting natural processes.

The government declared a state of emergency after the riot broke out in the city center.
The governor declared a state of emergency in response to the devastating effects of the hurricane.
During the state of emergency, all citizens were required to stay indoors after dark.
The military was deployed to maintain order during the state of emergency.
A state of emergency was declared in the aftermath of the devastating earthquake.