Simul cum

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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.