"Breech" or "breach"?
Breech is used to refer to the back end of something, for example a gun or rifle. It is most frequently used today in the phrase 'breech birth', which is when a baby is born buttocks- or feet-first instead of head-first.
As a noun, breach can be used in a few ways, but all of them broadly mean 'a gap, break, or hole' in something.
This can refer to breaking a law, agreement, or code of conduct:
They stopped paying their rent, which was a breach of the rental agreement.
or it can refer to a physical hole or break in a wall or barrier:
The protesters gained access to the facility through a breach in the fence.
Breach can also be used as a verb, meaning 'to break through or make a hole' in something, as in:
We breached the perimeter of the facility by cutting a hole in the fence.
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