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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, n. The hole made by boring. Hence, the cavity or hollow of a gun, cannon, pistol or other fire-arm; the caliber; whether formed by boring or not. 1. Any instrument for making holes by boring or turning, as an auger, gimlet or wimble. BORE, n. A tide, swelling above another tide. A sudden influx of the tide into a river or narrow strait.