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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.
It also has been employed in a sense bores as a class (1883) and practice of being a bore (1864, a sense properly belonging to boreism, 1833). The word bore as a noun meaning a thing which causes ennui or annoyance is attested to since 1778; of persons by 1812.