Breech

1. (now only in the plural) A garment whose purpose is to cover or clothe the buttocks.
2. The buttocks or backside.
3. The part of a cannon or other firearm behind the chamber.
4. The external angle of knee timber, the inside of which is called the throat.
5. A breech birth.

1. To dress in breeches. (especially) To dress a boy in breeches or trousers for the first time.
2. To beat or spank on the buttocks.
3. To fit or furnish with a breech.

   to breech a gun

4. To fasten with breeching.
5. To cover as if with breeches.

adjective

Born, or having been born, breech.

adverb

With the hips coming out before the head.