noun
broach
A tapered tool for enlarging or shaping holes.
The machinist uses a tapered broach to enlarge the hole.
Etymology
The older word names a pointed implement such as a spit. The tool sense preserves that penetrating form, applied to an implement that cuts or shapes the inside of a hole.
More examples
- The jeweler selects a fine broach for the tiny opening.
- This broach cuts a square hole in the metal.
- The repair kit contains broaches in several sizes.
Forms
broach · broaches
broaching noun — Enlarging or shaping holes with a broach.
Similar words
- reamer
- Typically finishes round holes rather than cutting other internal shapes.
- drill
- Usually creates holes rather than reshaping existing openings.