Breech

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.
Ordnance. to fit or furnish (a gun) with a breech.
to clothe with breeches.
Contemporary Examples

Dems Need a Bachmann! Gloria Feldt September 9, 2011

Historical Examples

With the Naval Brigade in Natal (1899-1900) Lieutenant Burne.
Captain Blood Rafael Sabatini
Wau-nan-gee or the Massacre at Chicago Major John Richardson
The Golden Woman Ridgwell Cullum
On the Spanish Main John Masefield
The Return of Sherlock Holmes Arthur Conan Doyle
Warren Commission (3 of 26): Hearings Vol. III (of 15) The President’s Commission on the Assassination of President Kennedy
Artillery Through the Ages Albert Manucy
The British Navy Book Cyril Field

noun (briːtʃ)
the lower dorsal part of the human trunk; buttocks; rump
the lower part or bottom of something: the breech of the bridge
the lower portion of a pulley block, esp the part to which the rope or chain is secured
the part of a firearm behind the barrel or bore
(obstetrics) short for breech delivery
verb (transitive) (briːtʃ; brɪtʃ)
to fit (a gun) with a breech
(archaic) to clothe in breeches or any other clothing
n.