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camouflet

noun
ca·​mou·​flet | \¦kamə¦flā\
plural -s

Definition of camouflet 

1 : a mine so charged and placed that its detonation will destroy enemy mining tunnels

2a : an underground or subsurface explosion of a bomb or shell that leaves a sealed pocket of smoke and gas

b : a pocket formed in this way

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History and Etymology for camouflet

French, literally, smoke blown into a sleeper's face from lighted paper

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