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noun The inside diameter of a tubular structure.
verb To core or tunnel.
noun A person who bores, is boring.
verb To make weary or distracted by being uncompelling, uninteresting or tedious.
1. The inside diameter of a tubular structure.
2. A person who bores.
1. The internal diameter of a tube.
2. To drill, e.g. into the surface of a bone or tooth.