practice. When defendants who are sued jointly have separate defences, they may in general sever, that is, each one rely on his own separate defence; each may plead severally and insist on his own separate plea. See Severance. To separate. When two joint defendants separate in the action, each pleading separately his own plea and relying upon a separate defense, they are said to sever.
SEVER
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.