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bore. 1  A hole or passage made by or as if by use of a drill. 2  A hollow, usually cylindrical chamber or barrel, as of a firearm. 3  The interior diameter of a hole, tube, or cylinder. 4  The caliber of a firearm. 5  A drilling tool.
(plural bores) 1  A hole drilled or milled through something. the bore of a cannon. 2  The tunnel inside of a gun's barrel through which the bullet travels when fired. 3  A tool, such as an auger, for making a hole by boring. 4  A capped well drilled to tap artesian water. 5  One who inspires boredom or lack of interest.