noun
A piece of harness used on a horse to keep it from raising its head above a desired point.
(nautical) A spar, or piece of rigging that strengthens the bowsprit.
(mathematics) A stochastic process for which the conditional expectation of future values given the sequence of all prior values is equal to the current value.
A gambling strategy in which one doubles the stake after each loss.
(fencing) A strap attached to the sword handle, preventing a sword being dropped if disarmed.
verb
To employ the martingale strategy in gambling.