Longman Dictionary of Contemporary English
Wiktionary
n. A thick-walled building, usually under the ground, built so that people can keep away from dust after a nuclear explosion.
WordNet
n. a shelter to protect occupants from the fallout from an atomic bomb
Wikipedia
Fallout Shelter is a free-to-play mobile simulation video game developed by Bethesda Game Studios, with assistance by Behaviour Interactive, and published by Bethesda Softworks. Part of the Fallout series, it was released worldwide for iOS devices in June 2015, for Android devices in August 2015, and for Microsoft Windows in July 2016. The game tasks the player with building and managing their own Vault, a fallout shelter.
Upon release, Fallout Shelter received mostly positive reviews. Critics enjoyed the game's extension of the Fallout universe, the core gameplay, and its visual style. Common criticisms included the game's lack of depth, its use of unnecessary microtransactions, and its lack of an ending. The game grossed $5.1 million in microtransaction sales in the first two weeks after its release.
Usage examples of "fallout shelter".
He'd no idea how to construct a fallout shelter but he'd make something even if it was only on the lines of the World War II dug-out air-raid shelters.
If Fallout Shelter's Sealed Environment contained a Fallout, the demon had obviously not opened Inner Hatch since the time of the Flame Deluge, before the Simplification.
Will any of you here who have already built and stocked a fallout shelter please hold up your-hands?
But there's still a chance of survival in a fallout shelter, assuming we're lucky enough to find room somewhere.
Smart enough to hide out in that old fallout shelter my father built, too, and get our horses into the woods when the foragers from Salem came by.
And in return for your forthrightness, I'll tell you that the fallout shelter in the basement is proof against magical fallout as well.
Second and third class mail was used to insulate a new root cellar north of the house, the old root cellar having been dug by the former owner as a fallout shelter and never having been satisfactory as root cellar.