Use the word "indentured servant" in a sentence (:

An indentured servant is an individual who agreed to work for a person who owns a farm for an extended period of time (4-7 years).

In return, the farm owner would pay for that person's cost of traveling to the New World. With this in mind, here is a sentence you could use: The indentured servant worked tirelessly to pay off his debt to the plantation owner.