Définitions
1.NounThe section between the throat and shank of the mouthpiece of a brass instrument."More conical backbores give a richer tone, while more cylindrical ones give a brighter, more projected tone."
2.VerbTo modify (a weapon's barrel) so as to increase the bore diameter.
3.VerbTo 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).