Longman Dictionary of Contemporary English
Wiktionary
n. An air-raid shelter, a structure designed to give protection against bombs.
WordNet
n. a chamber (often underground) reinforced against bombing and provided with food and living facilities; used during air raids [syn: air-raid shelter, bombproof]
Wikipedia
A bomb shelter is any kind of a civil defense structure designed to provide protection against the effects of a bomb.
Usage examples of "bomb shelter".
Have a shiny new General Electronics H-bomb shelter in your back yard or be slaughtered.
The Navy searched us whe they came for the CBs, so they knew we had a bomb shelter.
Half of Bellingham is trooping through our basement because we've got a bomb shelter, a bomb shelter!
I thought back to what I had seen of the barbarism of the countryside beyond the London Dome, and I tried to imagine permanent life in an underground Bomb Shelter: I conjured up images of hollow-eyed children scurrying through darkened tunnels, and a population reduced by fear to servility and near-savagery.
You'll need to move to the bomb shelter beneath NSA headquarters very soon.
When Monique Dutourd had fled down into the bomb shelter below her brother's flat, Marseille, like all of France, had belonged to the Greater German Reich.
A recorded announcement broadcast via a continuous loop track, ordered that all personnel should to go the station's deep underground bomb shelter immediately.
I wondered what it would be like to live in America, with a color television and bomb shelter in every home.
Then they go down a stairway and are underground--in a bomb shelter, to be precise.
We can't spend the rest of our lives lurking in a bomb shelter, Hugh.