English Verb broaching present participle and gerund of broach Noun broaching (uncountable) A type of machining in which a tool (either rotating or nonrotating) moves through a linear toolpath to cut internal shapes that have corners. Hypernyms: machining < cutting Coordinate terms: slotting, shaping, drilling, reaming, milling, grinding; turning, boring, planingWikiwand - on Seamless Wikipedia browsing. On steroids.