Am mai facut sapaturi... si propunerea mea este:
counter-defendant/counter-plaintiff(claimant)
Am intalnit si cross-defendant/cross-claimant, presupun ca diferenta consta in utilizarea in US /UK. (Revin cu lamuriri daca le gasesc)
http://www.collinsdictionary.com/dictionary/english/counterc...
http://www.avvo.com/legal-answers/what-is-a--counter-defenda...
http://www.mssb.uscourts.gov/RoboHelp/ECF_Docketing_Guide/Ad...
When a counter-claim is filed, the Counter-Claimant(s) and Counter-Defendant(s) will be listed as parties on the case with party role type Counter-Claimant or Counter-Defendant, in addition to any other party roles.

http://law-dictionary.clearpointlaw.com/c/cross-defendant_St...

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Note added at 8 hrs (2014-03-04 16:02:11 GMT)
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Se pare ca diferenta dintre "counter-claim" si "cross-claim" nu tine de varietatea de limba, ci de alte aspecte.
What is a counterclaim?
Sometimes when you are sued, you have a claim against the person who is suing you. If your claim is based on the reason that you are being sued, you must file a counterclaim.
What are cross-claims?
Counterclaims exist between the original Plaintiff and Defendant in a lawsuit. Sometimes a Plaintiff sues more than one Defendant, or a Defendant may have a claim against another Defendant in the suit. This is called a cross-claim. A cross-claim is not compulsory, but it must arise out of the matters on which the original lawsuit (or counterclaim in the original suit) is based.
http://www.ohiolegalservices.org/public/legal_problem/courts...
What is the difference between a "counterclaim" and a "cross claim"? If you have been sued, and you believe that you have been wrongfully sued or that you have claims of your own against the person that sued you, then within a short time frame after the suit is filed, as specified in the rules of the court that you are in, you file a countersuit. Also called a counterclaim, this is a direct claim back against the person who has initiated the lawsuit. A cross claim, on the other hand, is against someone who is a co-defendant or co-plaintiff.
http://www.avvo.com/legal-guides/ugc/counter-claims-and-cros...
A counterclaim is a claim by a defendant against a plaintiff. A crossclaim is a claim by a defendant against a defendant.
http://answers.yahoo.com/question/index?qid=20090210192515AA...