simul cum

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
SIMUL CUM, pleading. Together with. These words are used in indictments and 
declarations of trespass against several persons, when some of them are 
known and others are unknown. 
     2. In cases of riots it is usual to charge that A B, together with 
others unknown, did the act complained of. 2 Chit. Cr. Law, 488; 2 Salk. R. 
593. 
     3. When a party sued with another pleads separately, the plea is 
generally entitled in the name of the person pleading, adding "sued 
with___," naming the other party. When this occurred, it was, in the old 
phraseology, called pleading with a simul cum. 
    

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