probably from the base of ὄφελος (through the idea of accruing); to owe (pecuniarily); figuratively, to be under obligation (ought, must, should); morally, to fail in duty:--behove, be bound, (be) debt(-or), (be) due(-ty), be guilty (indebted), (must) need(-s), ought, owe, should. See also ὄφελον.