bunker-buster

bunker buster

noun
a laser-guided bomb designed to penetrate deep underground, as into rock or concrete, before detonating.
Also, bunker-buster.
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WordNet
bunker buster

noun
a 5,000 pound laser-guided bomb that can be programmed to penetrate to a given depth before exploding; used to penetrate hardened underground facilities 
WordNet® 3.0, © 2006 by Princeton University.
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