backbore
The English word “backbore” has 3 meanings listed here.
noun
- The section between the throat and shank of the mouthpiece of a brass instrument.
verb
- To modify (a weapon's barrel) so as to increase the bore diameter.
- To bore from the backside of a workpiece by using a boring tool that passes through one or more through holes, deploys a cutting edge (or receives it by manual insertion from an operator), bores a feature on the far side, retracts the cutting edge (or has it removed), and then retreats back through the hole (toward the tool's origin).
Etymology
From back + bore.
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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.