1. 应付欠款；（尤指）逾期债款
Arrears are amounts of money that you owe, especially regular payments that you should have made earlier.

2. 拖欠（付款）
If someone is in arrears with their payments, or has got into arrears, they have not paid the regular amounts of money that they should have paid.

3. （工资等）后付的
If sums of money such as wages or taxes are paid in arrears, they are paid at the end of the period of time to which they relate, for example after a job has been done and the wages have been earned.

4. （体育比赛中成绩或比分）落后的
If someone is in arrears in a sports match or race, they are not winning, because they have a lower score or slower time than other competitors.

1. an unpaid overdue debt

2. the state of being behind in payments

e.g. an account in arrears