Breech or breach?

Breech: 1. (noun) The opening in the rear of the barrel of a gun where bullets can be loaded; the part of a cannon behind the bore; the back part of a rifle or gun barrel. 2. (verb) Dress (a boy) in breeches after he has been in petticoats since birth. 3. (noun) The lower rear portion of the human trunk; the buttocks.  4. (noun) A breech presentation or delivery; a fetus in breech presentation.

Breach:  1. (noun) A failure to follow a law or rule.  2. A failure to do something that you have promised to do or that people expect you to do.  3. A situation in which someone does something that goes against accepted rules of social behavior.  4. A serious disagreement.  5. A space made in a wall, fence, or line of defense, especially during a military attack.  6. (verb) To break a law, rule, or agreement.  7. To get through something such as a wall or fence.