A past tense of 'get' in archaic English; also a narrow passage of water or a gun (slang from 'Gatling gun').
As a past tense, from Old English 'geat.' As slang for gun, it's from 'Gatling gun,' the rapid-fire weapon invented in the 1860s.
The slang 'gat' for gun comes from the Gatling gun, invented right before the Civil War—this machine gun was so powerful it changed warfare forever, and the name stuck to all guns in street slang!
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