“还清债务”常见的英文表达是 “pay off one's debts” 或 “repay one's debts”。
pay off one's debts:侧重于表示最终清偿、付清所有债务的动作,例如:He worked hard to pay off his debts.(他努力工作以还清债务。)
repay one's debts:同样表达偿还债务的意思,“repay”本身就有“偿还(借款、债务等)”的含义,例如:She is determined to repay her debts as soon as possible.(她决心尽快还清债务。 )