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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.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Boring. of Bore. 2  Boring(noun) the act or process of one who, or that which, bores; as, the boring of cannon; the boring of piles and ship timbers by certain marine mollusks. 3  Boring(noun) a hole made by boring.  Boring(noun) the chips or fragments made by boring.