ar·rears 
/əˈriɚz/ noun
/əˈriɚz/ noun [plural] 1 : money that is owed and that has not been paid when it should be
▪ He's been trying pay off the arrears on his mortgage. ▪ alimony/rent arrears 2 — used to describe a situation in which someone has failed to make a regular payment at the required time ▪ He is two months in arrears [=behind] with his mortgage payments. ▪ The account is two months in arrears. [=overdue, delinquent] ▪ He has fallen into arrears on his mortgage payments. 3 — used to describe a situation in which someone is paid money that was earned at an earlier time ▪ You will be paid interest on your investment in arrears. ▪ construction workers paid in arrears for their work
▪ He's been trying pay off the arrears on his mortgage. ▪ alimony/rent arrears
