civil defense

American  

noun

1. plans or activities organized by civilians and civilian authorities for the protection of civilian population and property in times of such disasters or emergencies as war or floods.

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Etymology

Origin of civil defense

First recorded in 1935–40

Example Sentences

“We’ll be here till tomorrow dealing with this blaze,” said Major Issa Hamdoun, a civil defense commander, as he watched his men manhandling the fire hose into the wreckage of the building.

From Los Angeles Times • May 24, 2026

South Korea has massively invested in civil defense.

From The Wall Street Journal • Apr. 10, 2026

"It rained a lot, the riverbank collapsed even further, and civil defense called us to evacuate," Luiz Otavio Souza, a 35-year-old salesman who had to leave his home and whose nephew is missing, told AFP.

From Barron's • Feb. 26, 2026

"It requires surveys to discover and track NEOs, campaigns to characterize those that are hazardous, modeling efforts to understand and predict impact effects and associated consequences, and mitigation through impact avoidance and/or civil defense."

From Science Daily • Oct. 31, 2025

I remember well, for instance, the blind animal terror which ensued when some townie set off the civil defense sirens as a joke.

From "The Secret History" by Donna Tartt