A chafe bit is a piece of equipment that is used to protect a horse's mouth from irritation or discomfort caused by the use of a bit. However, there are a number of synonyms that can also be used to describe this type of equipment. These include a bit guard, bit cover, bit pad or bit sleeve. Each of these terms refers to a device designed to provide cushioning and/or protection to the horse's mouth from the pressure and friction that can be caused by a bit. They're an important tool in horse riding and are essential for both the comfort of the horse and the safety of the rider.