English

Noun

1. Work to be done, obligation.

   I have a large arrear of letters to write. -- J. D. Forbes.

   My own work, with its manifold arrears, took me all day to clear off. -- Stoker, Dracula

2. Unpaid debt.

Adverb

1. behind, backward

   (--) rent considerably in arrear, and heartless landlady threatening expulsion (--) -- Dickens: Our Mutual Friend

Spanish

Verb

1. To urge.
2. To harness.

Conjugation