(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.