martingale
/ˈmɑːtɪŋɡeɪl/
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noun
plural noun: martingales
1.
a strap or set of straps running from the noseband or reins to the girth of a horse, used to prevent the horse from raising its head too high.
2.
a gambling system of continually doubling the stakes in the hope of an eventual win that must yield a net profit.