In sb's debt 欠某人的债

pay off sb't debt 还清债务

She was still 600 yuan in debt.

她还欠600元钱。

I need to pay off all my debts before I leave the country.

我要在离开该国前还清所有债务。

A:Mom,could you give me 50 dollars?

妈妈，可以给我50美元吗?

B:What are you gonna do?

你要做什么?

A:I am 50 dollars in Jack's debt.

我还欠杰克50美元。