arrearage

Arrearage \Ar*rear"age\, n. [F. arr['e]rage, fr. arri[`e]re, OF.
   arere. See {Arrear}.]
   That which remains unpaid and overdue, after payment of a
   part; arrears.
   [1913 Webster]

         The old arrearages . . . being defrayed. --Howell.
   [1913 Webster] Arrect
    

48 Moby Thesaurus words for "arrearage":
      arrear, arrears, back debts, back payments, bouncing check, break,
      debt, decline, defalcation, default, defect, defectiveness,
      deferred payments, deficiency, deficit, deficit financing,
      delinquency, discontinuity, dollar gap, due, failure,
      falling short, gap, hiatus, imperfection, inadequacy, indebtedness,
      inferiority, insufficiency, interval, lack, lacuna, liability,
      missing link, need, obligation, omission, outage, overdraft,
      short measure, shortage, shortcoming, shortfall, slump, ullage,
      underage, want, wantage