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bunker buster

noun
1.
a laser-guided bomb designed to penetrate deep underground, as into rock or concrete, before detonating.
Also, bunker-buster.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for bunker buster
noun

a nuclear laser-guided bomb that can be programmed to penetrate the ground or rock to a certain depth before exploding

Word Origin

relation to bunker is that this bomb penetrates hardened underground facilities

Dictionary.com's 21st Century Lexicon
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