The process of drilling a larger hole at the opening of an existing hole, usually to recess bolt heads or create a specific diameter change.
From counter- (opposite direction) + boring (the action of drilling), + -ing (gerund). Developed as manufacturing terminology in the 19th and 20th centuries.
Counterboring taught engineers an important lesson: by carefully planning where fasteners go, you can make products both stronger and more aesthetically perfect at the same time.
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