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1. A shotgun bore that narrows toward the muzzle to prevent wide scattering of the shot.
2. A gun with a narrowed bore near the muzzle.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Firearms, Gunnery, Ordnance & Artillery) a shotgun bore that becomes narrower towards the muzzle so that the shot is not scattered
2. (Firearms, Gunnery, Ordnance & Artillery) a shotgun having such a bore
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014