A gambling system of continually doubling the stakes in the hope of an eventual win that must yield a net profit
MARTINGALE, a strap from the reins to the girth of a horse preventing it from carrying its head too high also MARTINGAL [n]
A strap, or set of straps, attached at one end to the noseband (standing martingale) or reins (running martingale) of a horse and at the other end to the girth. It is used to prevent the horse from raising its head too high