BoltSudden veering from a straight course, usually to the outside rail.
BombA winning horse sent off at extremely high odds.
Book1) The group of mares being bred to a stallion in a given year. If a stallion attracts the maximum number of mares allowed by the farm manager, he has a full book. 2) A term used to describe a jockey's riding commitments with his agent An agent handles a jockey's book.
Bottom1) Stamina in a horse. 2) Subsurface of a racing strip.
Bottom LineA Thoroughbred's breeding on the female side. The lower half of an extended pedigree diagram.
BounceA poor race run directly following a career-best or near-best performance.
BoxA wagering term denoting a combination bet whereby all possible numeric combinations are covered.
Boxed (In)To be trapped between, behind or inside of other horses.
Brace (or Bracer)Rubdown liniment used on a horse after a race or workout.
Break (a horse)1) To train a young horse to wear a bridle and saddle, carry a rider and respond to a rider's commands. Almost always done when the horse is a yearling. 2) To leave from the starting gate.
Break MaidenHorse or rider winning the first race of its career. Also known as "earning a diploma."
BreakageIn parimutuel payoffs, which are rounded down to a nickel or dime, the pennies that are left over. Breakage may be used for any of a number of purposes, depending upon a state's rules of racing.
BreatherEasing off on a horse for a short distance in a race to permit it to conserve or renew its strength.
Bred1) A horse is considered to have been bred in the state or country of its birth -- Secretariat was a Virginia-bred. 2) The past tense of "breed."
BreederOwner of the dam at time of foaling unless the dam was under a lease or foal-sharing arrangement at the time of foaling. In that case, the person(s) specified by the terms of the agreement is (are) the breeder(s) of the foal.
Breeders' CupThoroughbred racing's year-end championships conducted on back-to-back days at a different racetrack each year, consisting of 14 races, and with purses and awards totaling over $25 million.
Breeding FundA state fund set up to provide bonuses for state-breds.
Breeze (Breezing)Working a horse at a moderate speed, less effort than handily.
Bridge JumperA person who wagers large amounts of money, usually on short-priced horses to show, hoping to realize a small, but certain profit. The term comes from the structure these bettors may seek if they lose.
BridleA piece of equipment, usually made of leather or nylon, which fits on a horse's head and is where other equipment, such as a bit and the reins, are attached
BroodmareA filly or mare that has been bred and is used to produce foals.
Brush1) During a race, two horses who slightly touch each other. 2) Injury that occurs when one hoof strikes the inside of the opposite limb.
Bucked ShinsInflammation of the covering of the bone of the front surface of the cannon bone to which young horses are particularly susceptible. This is primarily a condition of the front legs.
Bug BoyAn apprentice rider.
Bulbs (of the heel)The two areas on either side of the back of the foot, similar to the heel of the hand.