behind with paying money that is owed
拖欠钱款
two out of three tenants are in arrears.
2/3的房客拖欠房租。
(of a competitor in a sports race or match) having a lower score or weaker performance than other competitors
(赛跑或其他体育比赛中的选手）落后于其他选手的
she finished ten metres in arrears.
比赛结束时，她落后了十米。