[n. breech; v. breech, brich]
the lower, rear part of the trunk of the body; buttocks.
the hinder or lower part of anything.
Ordnance. the rear part of the bore of a gun, especially the opening and associated mechanism that permits insertion of a projectile.
Machinery. the end of a block or pulley farthest from the supporting hook or eye.
Nautical. the outside angle of a knee in the frame of a ship.
verb (used with object)
Ordnance. to fit or furnish (a gun) with a breech.
to clothe with breeches.

before 1000; Middle English breeche, Old English brēc, plural of brōc; cognate with Old Norse brōk, Old High German bruoh

unbreeched, adjective

breach, breech (see synonym study at breach). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  the lower dorsal part of the human trunk; buttocks; rump
2.  the lower part or bottom of something: the breech of the bridge
3.  the lower portion of a pulley block, esp the part to which the rope or chain is secured
4.  the part of a firearm behind the barrel or bore
5.  obstetrics short for breech delivery
6.  to fit (a gun) with a breech
7.  archaic to clothe in breeches or any other clothing
usage  Breech is sometimes wrongly used as a verb where breach is meant: the barrier/agreement was breached (not breeched)

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

"back part of a gun or firearm," 1570s, from sing. of breeches (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

breech (brēch)
The lower rear portion of the human trunk; the buttocks.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Deeper than than and the water pressure than breech the o-rings.
In guns, backfire is an explosion toward the the breech rather than the muzzle
  of a firearm.
The lever-action breech mechanism allowed the user to fire a number of shots
  before having to reload.
Shells must be loaded by hand into the breech of the gun.
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