Webster's Revised Unabridged Dictionary · 1913

Breech

Breech (brēch or brich; 277) , noun

[See Breeches.]

1.
The lower part of the body behind; the buttocks.
2.
Breeches. [Obsolete] — Shakespeare
3.
The hinder part of anything; esp., the part of a cannon, or other firearm, behind the chamber.
4.
(Nautical) The external angle of knee timber, the inside of which is called the throat.

Breech ({not transcribed}) , transitive verb

1.
To put into, or clothe with, breeches.
A great man... anxious to know whether the blacksmith's youngest boy was breeched. — Macaulay
2.
To cover as with breeches. [Poetic]
Their daggers unmannerly breeched with gore. — Shakespeare
3.
To fit or furnish with a breech; as, to breech a gun.
4.
To whip on the breech. [Obsolete]
Had not a courteous serving man conveyed me away, whilst he went to fetch whips, I think, in my conscience, he would have breeched me. — Old Play
5.
To fasten with breeching.