Bit (horse)
TYPE OF HORSE TACK
Horse bit; Horse bits; Champing at the bit; Chomping at the bit; Horse's bit; Horsebit
The bit is an item of a horse's tack. It usually refers to the assembly of components that contacts and controls the horse's mouth, and includes the shanks, rings, cheekpads and mullen, all described here below, but it also sometimes simply refers to the mullen, the piece that fits inside the horse's mouth.