Etymology
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brig (n.)

"two-masted square-rigged vessel," 1720, colloquial shortening of brigantine (q.v.). Meaning "a ship's jail" is by 1841, American English, perhaps from the use of such vessels as prison ships upon retirement from active duty.

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Definitions of brig

brig (n.)
two-masted sailing vessel square-rigged on both masts;
brig (n.)
a penal institution (especially on board a ship);
From wordnet.princeton.edu