“When a debtor, in an action brought against him by his creditor, pleads compensation to a certain extent of the debt sued for, quoad the sum due to him … the creditor’s right of action falls; but quoad reliquum, after making deduction of the sum pled in compensation, the creditor’s right of action remains.” John Trayner, Trayner’s Latin Maxims 526 (4th ed. 1894).
quoad reliquum
quoad reliquum (kwoh-ad rel-[schwa]-kw[schwa]m). [Latin] Hist. With regard to the remainder.