arrears
n[pl]
1 money that is owed and should have been paid earlier (过时未付的)欠款
arrears of salary 欠薪 * rent arrears 欠租.
2 work that has not yet been done 未做完的工作
arrears of correspondence, ie letters waiting to be answered 待覆的信件.
3 (idm 习语) be in/fall into arrears (with sth)
(a) be late in paying money that is owed 拖欠
I have fallen into arrears with my rent. 我已经拖欠租金了.
Payment is made in arrears, ie at the end of the period in which eg the work was done. 後行付款(在最後的一段时间付款, 例如工作完成後).
(b) be late in doing work that is necessary 拖延(应做的事)
I´m in arrears with the housework. 我的家务事还拖著呢.