martingale

martingale
[ˈmɑːtɪŋgeɪl]
noun
  1. 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
    马颔缰
  2. [mass noun]a gambling system of continually doubling the stakes in the hope of an eventual win that must yield a net profit
    输后加倍下注的赌法
语源
  1. late 16th cent.: from French, from Spanish almártaga, from Arabic al-marta‘a 'the fastening', influenced by martingale, from Occitan martegal 'inhabitant of Martigues (in Provence')
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