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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.
Sense of be tiresome or dull first attested 1768, a vogue word c.1780-81 according to Grose; possibly a figurative extension of to move forward slowly and persistently, as a boring tool does. bore