Breeches and Rear of barrel

Breeches noun - Trousers ending above the knee.

Rear of barrel is a synonym for breeches. In some cases you can use "Rear of barrel" instead a noun "Breeches".

Rear of barrel noun - Opening in the rear of the barrel of a gun where bullets can be loaded.

Breeches is a synonym for rear of barrel. Sometimes you can replace term "Breeches" with "Rear of barrel", this terms are similar.