What is the meaning of Breech?

A garment whose purpose is to cover or clothe the buttocks.

The buttocks or backside.

The part of a cannon or other firearm behind the chamber.

The external angle of knee timber, the inside of which is called the throat.

A breech birth.

With the hips coming out before the head.

Born, or having been born, breech.

To dress in breeches. To dress a boy in breeches or trousers for the first time (the breeching ceremony).

To beat or spank on the buttocks.

To fit or furnish with a breech.

To fasten with breeching.

To cover as if with breeches.

Source: wiktionary.org