bombproof

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a chamber (often underground) reinforced against bombing and provided with food and living facilities; used during air raids
verb make safe against bombings
adjective able to resist the explosive force of bombs and shells

From bomb + -proof.

And I crawled out of the bombproof shelter. — My man Jeeves, P. G. (Pelham Grenville) Wodehouse
"I am on duty at Staff Bombproof South to-night. — The Dop Doctor, Richard Dehan
You'd turn up your pretty little nose, and accept the arm of some damned bombproof--Look out! — The Long Roll, Mary Johnston

bomb shelter, air-raid shelter

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