›COMMERCEthe act of paying someone too little for the work they do, or an occasion when this happens: Problems included underpayments to some employees.
›the act of paying less than is necessary or less than the value of something, or an occasion when this happens: She received a bill for underpayment of more than $1000.Much of the surplus is the result of underpayments to past policyholders.
›BANKING, FINANCEthe act of making smaller payments than originally agreed when paying back a loan, or an occasion when this happens: It is important to have a loan with flexible features, which allow overpayment and underpayment.You will be charged interest and possibly surcharges on any underpayment.