breech

Short definition from Wiktionary

Noun

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

Adverb

1. 1
   With the hips coming out before the head.

Adjective

1. 1
   Born, or having been born, breech.

Verb

1. 1
   To dress in breeches. (especially) To dress a boy in breeches or trousers for the first time (the breeching ceremony).
2. 2
   To beat or spank on the buttocks.
3. 3
   To fit or furnish with a breech.
4. 4
   To fasten with breeching.
5. 5
   To cover as if with breeches.