Definition of fallout shelter
: a shelter built underground to protect people from radioactive fallout
Beginning in the 1970s, curious tales began to emerge from Washington, D.C., about a "doomsday hotel." Located near the nation's capital, it was said to be the ultimate fallout shelter. But only for the well-connected. — Popular Mechanics
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Merriam-Webster unabridged
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Time Traveler for fallout shelter
The first known use of fallout shelter was in 1955
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