An unpaid, overdue debt or an unfulfilled obligation.

欠帐未付的，逾期债款或未履行的职责。

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A month prior, faced with about $15,000 in unpaid tuition and overdue bills, Taylor and her roommate typed "tuition," "debt," and "money for school" into Google.

一个月之前，面对1.5万美元的学费以及各种过期未付的账单，泰勒和她的室友在Google的搜索栏中输入了“学费”、“债务”和“上学开销”这三个关键词。

youdao

People who owe comparatively large amount of debt which is overdue.

个人所负数额较大的债务到期未清偿的。

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Rolling Jubilee chose Louisville as its second target because it got a good deal on overdue debt.

WSJ: Group pays medical debt for more than 1,000

This amounts to little more than a means of bilking the American taxpayer in order to liquidate an outstanding, long-overdue debt to the U.S. Treasury.

CENTERFORSECURITYPOLICY: The U.S.-Soviet Trade Agreement: Overtaken By Events

This broke a taboo on the restructuring of debt to multilateral agencies, and set up a framework for systematic debt reduction in return for overdue economic house-cleaning.

ECONOMIST: For this relief, some thanks