Definition of arse

The word "arse" has a fascinating etymology. It originated in Old English as "ars" or "ers", which referred to the back part of the body. This is thought to be imitative of the sound made when sitting down, specifically the noise made by the buttocks hitting the seat. Over time, the spelling evolved to "arse", and the meaning expanded to include the buttocks themselves. In Middle English (circa 1100-1500), "arse" became a common term for the rear end, and it's been used in this sense in British English ever since. Interestingly, while "arse" is still a common British slang term, it's often replaced with alternative euphemisms in American English, such as "butt" or "behind".