The term "bore" has multiple meanings, depending on the context. Here are some of the most common definitions:

• A hole made by drilling: A bore can refer to a hole made by a drill or other tool. It can also refer to a tunnel, mine, well, or passage made by hollowing out or cutting through material.

• The diameter of a cylinder in an engine: In the context of engines, the bore is the diameter of each cylinder). Engine displacement is calculated based on bore, stroke length, and the number of cylinders.

• A tidal flood: A bore can also refer to a tidal flood with a high abrupt front.

• A dull or tiresome person or thing: If someone or something is boring, they cause weariness and restlessness through lack of interest. A bore can refer to a dull or tiresome person or thing that causes boredom.

Overall, the term "bore" can refer to a hole made by drilling, the diameter of a cylinder in an engine, a tidal flood, or a dull or tiresome person or thing.