double-barreled assault and battery
(Not to be confused with domestic violence,m since more often than not, domestic violence is single-handedly one-sided): when both partners in a relationship commit physical, mental, emotional and psychological violence and abuse against each other, usually following acrimonious arguments.
IMHO Slava Voynov's recent case is double-barreled assault and battery, not domestic violence, since both he and his girlfriend required medical attention following the incident.
double-barreled assault and battery by Uncle Dimma January 12, 2015
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