- Also called standing martingale. part of the tack or harness of a horse, consisting of a strap that fastens to the girth, passes between the forelegs and through a loop in the neckstrap or hame, and fastens to the noseband: used to steady or hold down the horse's head.
- Also called running martingale. a similar device that divides at the chest into two branches, each ending in a ring through which the reins pass.
- Nautical. a stay for a jib boom or spike bowsprit.
- a system of gambling in which the stakes are doubled or otherwise raised after each loss.
"Only the horses remained, in their enormous silver-mounted saddles and their bridles and martingales whose leather was a crust of filigree and rosettes."
- Wallace Stegner, Angle of Repose