One of the mysteries of the English language finally explained.
1A breech-loading gun, the barrel and stock of which are joined by a screw; especially (in later use) a cannon or large gun which unscrews into separate parts for ease of transport. Now chiefly historical.
2An electrically-powered hand-held device used to turn a screw into or out of its place, typically resembling and operating in a way similar to a power drill.
Late 17th century. From screw + gun.
screw gun/ˈskruː ɡʌn/
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