martingale
noun
mar·tin·gale
ˈmär-tᵊn-ˌgāl
-tiŋ-
1
: a device for steadying a horse's head or checking its upward movement that typically consists of a strap fastened to the girth, passing between the forelegs, and bifurcating to end in two rings through which the reins pass
2
a
: a lower stay of rope or chain for the jibboom used to sustain the strain of the forestays and fastened to or rove through the dolphin striker
b
3
: any of several systems of betting in which a player increases the stake usually by doubling each time a bet is lost
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Merriam-Webster unabridged
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