From Longman Dictionary of Contemporary Englishbomb shelterˈbomb ˌshelter noun [countable] PMDa room or building that is built to protect people from bomb attacks
Examples from the Corpus
bomb shelter• Bennett persuades his family to build a bomb shelter.• Every church compound has a bomb shelter.• The only thing less suited to the big screen would be a movie set in a bomb shelter.• The idea of turning the most historic room in the nation into a bomb shelter struck me as in exceedingly bad taste.• Feb. 13 At least 300 civilians killed in allied attack on Baghdad bomb shelter.• They even went down to the basement bomb shelter and shook pillows.• I heard new vocabulary: nuclear bomb, radioactive fallout, bomb shelter. 