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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.
Bore(noun) the size of a hole; the interior diameter of a tube or gun barrel; the caliber. Bore(noun) a tool for making a hole by boring, as an auger. Bore(noun) caliber; importance. Bore(noun) a person or thing that wearies by prolixity or dullness; a tiresome person or affair; any person or thing which causes ennui.