|the offspring of a zebra and a donkey.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|1.||(sometimes singular) Also called: arrearage something outstanding or owed|
|2.||in arrears, in arrear late in paying a debt or meeting an obligation|
|[C18: from obsolete arrear (adv) behindhand, from Old French arere, from Medieval Latin adretrō, from Latin ad to + retrō backwards]|
see in arrears.