"bombproof" 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
"bombproof" in the verb sense
1. bombproof
make safe against bombings
"bombproof" in the adjective sense
1. bombproof, shellproof
able to resist the explosive force of bombs and shells
"bombproof shelter"
Source: WordNet® (An amazing lexical database of English)
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