"bombproofs" in the noun sense
1. bomb shelter, air-raid shelter, bombproof
a chamber (often underground) reinforced against bombing and provided with food and living facilities used during air raids
"bombproofs" in the verb sense
1. bombproof
make safe against bombings
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License