Machinery. an elongated, tapered, serrated cutting tool for shaping and enlarging holes.
a spit for roasting meat.
a gimlet for tapping casks.
(in a lock) a pin receiving the barrel of a key.
Also, broach spire. Architecture. an octagonal spire rising directly from a tower without any intervening feature.
Masonry. a pointed tool for the rough dressing of stone.
verb (used with object)
to enlarge and finish with a broach.
to mention or suggest for the first time: to broach a subject.
to draw (beer, liquor, etc.), as by tapping: to broach beer from a keg.
to tap or pierce.
Masonry. to shape or dress (a block of stone).
verb (used without object)
Nautical. (of a sailing vessel) to veer to windward.
to break the surface of water; rise from the sea, as a fish or a submarine.

1175–1225; (noun) Middle English broche < Anglo-French, Old French < Vulgar Latin *brocca spike, horn, tap of a cask (Medieval Latin broca), noun use of feminine of Latin adj. brocc(h)us projecting (said of teeth); (v.) Middle English brochen < Old French broch(i)er, derivative of the noun

broacher, noun
unbroached, adjective

broach, brooch.

8. introduce, propose, bring up, submit, advance. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
broach1 (brəʊtʃ)
1.  (tr) to initiate (a topic) for discussion: to broach a dangerous subject
2.  (tr) to tap or pierce (a container) to draw off (a liquid): to broach a cask; to broach wine
3.  (tr) to open in order to begin to use: to broach a shipment
4.  (intr) to break the surface of the water: the trout broached after being hooked
5.  (tr) machinery to enlarge and finish (a hole) by reaming
6.  a long tapered toothed cutting tool for enlarging holes
7.  a spit for roasting meat, etc
8.  a roof covering the corner triangle on the top of a square tower having an octagonal spire
9.  a pin, forming part of some types of lock, that registers in the hollow bore of a key
10.  a tool used for tapping casks
11.  a less common spelling of brooch
[C14: from Old French broche, from Vulgar Latin brocca (unattested), from Latin brochus projecting]

broach2 (brəʊtʃ)
(usually foll by to) nautical to cause (a sailing vessel) to swerve sharply and dangerously or (of a sailing vessel) to swerve sharply and dangerously in a following sea, so as to be broadside to the waves
[C18: perhaps from broach1 in obsolete sense of turn on a spit]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pointed instrument," c.1300, from O.Fr. broche (12c.) "spit for roasting, awl, point end, top," from V.L. *brocca "pointed tool," originally fem. of L. adj. broccus "projecting, pointed" (used especially of teeth), perhaps of Gaulish origin (cf. Gaelic brog "awl").

"begin to talk about," 1570s, from figurative use of the lit. meaning "to pierce" (early 14c.), with suggestions of "broaching" a cask or spurring into action (cf. O.Fr. brochier, 12c., "to spur," also "to penetrate sexually"); from the same source as broach (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

broach (brōch)
A dental instrument for removing the pulp of a tooth or exploring its canal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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