\Choke"bore`\, n.
1. In a shotgun, a bore which is tapered to a slightly
   smaller diameter at a short distance (usually 21/2 to 3
   inches) to the rear of the muzzle, in order to prevent the
   rapid dispersion of the shot.
2. A shotgun that is made with such a bore.

\Choke"bore`\, v. t. [imp. & p. p. {Chokebored}; p.
pr. & vb. n. {Chokeboring}.]
To provide with a chokebore.