Definition of "arrear" in English

adverb

1. (obsolete) Towards the rear, backwards.

2. (obsolete) Behind time; overdue.

noun

1. Work to be done, obligation.

   • November 4, 1866, James David Forbes, letter to E. C. Batten I have a large arrear of letters to write.

2. Unpaid debt.

   • fall into arrears

3. That which is in the rear or behind.