fallout shelter

noun

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

First Known Use of fallout shelter

1955, in the meaning defined above

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The first known use of fallout shelter was in 1955

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