The term "ARF" can refer to different things depending on the context. It can stand for "acute renal failure," which is a sudden episode of kidney failure or kidney damage that happens within a few hours or days. This condition is characterized by the kidneys not working as well as they once did, leading to a build-up of waste products in the blood and a decrease in urine output

. Additionally, "ARF" can also be used as an interjection to imitate the bark of a dog