cross bills

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
CROSS BILLS, practice. When an individual prosecutes a bill of indictment 
against another, and the defendant procures another bill to be found against 
the first prosecutor, the bills so found by the grand jury are called cross 
bills. The most usually occur in cases of assault and battery. 
    2. In chancery practice it is not unusual for parties to file cross 
bills. Vide Bill, cross. 
    

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