redemptioner（n.）
"一个可以被赎回或释放的人，特指在美国历史上的“契约奴隶”，1775年，来自于 redemption + -er (1)。
REDEMPTIONER. One who redeems himself or purchases his release from debt or obligation to the master of a ship by his services; or one whose services are sold to pay the expenses of his passage to America. [Webster, 1830]
赎回人。通过自己的服务赎回自己或从船主的债务或义务中购买自己的释放的人； 或者是他的服务被出售以支付他前往美国的费用。[Webster，1830]