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.
Noun. An expedition involving the acquisition of some good, usually perceived as essential, when in fact completely unnecessary. Because errands involve a component of travel, they are often confused for a leisure activity. From the root, errant, aimless.