arrear UK /əˈɹɪə/US /əˈɹɪɹ/noun 3adverb 2forms 3 noun3 •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. •Unpaid debt.I know the debt is in arrears / The dog has not been fed in years / It's even worse than it appears, but / It's alright — 1987 •That which is in the rear or behind. adverb2 •(no longer used) Behind time; overdue.In case the annuity should be arrear for sixty days being lawfully demanded, then the trustee might enter upon the premises assigned [...]. — 1803 •(no longer used) Towards the rear, backwards.She, (Ladie) having well before approoved / The feends to be too cruell and severe, / Observ'd th' appointed way, as her behooved, / Ne ever did her ey-sight turne arere [...]. — 1591 formsarrears · more arrear · most arrear