An end or backside of an animal, such as a horse or cow, is called its butt.
When people talk about animals, they often use "butt" to describe where the legs meet the body. For example, if you're riding a horse and it suddenly stops in its tracks, you might say "Watch out for its butt!" meaning be careful not to kick your own leg or the ground near its backside. You can also see this word used when describing animals that get their rear ends tangled up in fences, like a goat stuck in barbed wire.
The larger or thicker end of something; the blunt end, in distinction from the sharp or narrow end
To join at the butt, end, or outward extremity; to terminate; to be bounded; to abut.
