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.
For example, mortgage interest in the U.S. is paid in arrears, which means that in the case of monthly payments, each payment covers principal repayment and mortgage interest for the month preceding the payment due date.verdue debt, liability or obligation. An account is said to be in arrears if one or more payments have been missed in transactions where regular payments are contractually required, such as mortgage or rent payments and utility or telephone bills.