Merriam-Webster's Collegiate® Dictionary, 11th Edition
BROACH
I. noun
Etymology: Middle English broche, from Anglo-French, from Vulgar Latin *brocca, from Latin, feminine of broccus projecting
Date: 13th century
brooch , any of various pointed or tapered tools, implements, or parts: as, a spit for roasting meat, a tool for tapping casks, a cutting tool for removing material from metal or plastic to shape an outside surface or a hole,
II. verb
Date: 15th century
transitive verb
1. to pierce (as a cask) in order to draw the contents, to open up or break into (as a mine or stores), to shape or enlarge (a hole) with a broach,
3. to make known for the first time, to open up (a subject) for discussion, intransitive verb to break the surface from below, see: express broacher noun
III. intransitive verb
Etymology: perhaps from 2broach
Date: 1705
to veer or yaw dangerously so as to lie broadside to the waves