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roscoe

[ros-koh]
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noun Older Slang.
  1. a revolver or pistol.

Origin of roscoe

An Americanism dating back to 1910–15; of uncertain origin

Roscoe

[ros-koh]
noun
  1. a male given name: from Germanic words meaning “swift” and “horse.”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for roscoe

n.

"revolver," 1914, criminals' slang, from the proper name, for some reason.

Online Etymology Dictionary, © 2010 Douglas Harper