MUSCLES OF RESPIRATION. When the diaphragm contracts in inspiration, initially the lower ribs are fixed and the dome of the diaphragm descends, thus increasing the vertical diameter of thorax.
arrearage. 1  the state or condition of being in arrears. 2  Often, arrearages. arrears; amount or amounts overdue. 3  Archaic. a thing or part kept in reserve.
There are two common meanings associated with arrears accounting: 1  Payment in arrears can refer to the practice of compensating a service provider after the terms of the agreement has been met. 2  Arrears can also refer to the fact that a business is behind on payments.