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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.
Wiktionary (5.00 / 1 vote) Rate this definition: bore (Noun). A sudden and rapid flow of tide in certain rivers and estuaries which rolls up as a wave; an eagre. Origin: From borian.