pig boat

pigboat

[pig-boht]
noun Older Slang.
a submarine.

Origin:
1920–25, Americanism; pig1 + boat

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
pigboat

noun
a submersible warship usually armed with torpedoes [syn: submarine
WordNet® 3.0, © 2006 by Princeton University.
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