What's Cross-Claim?

A cross-claim is any claim by one party against a co-party arising out of the transaction or occurrence that is the subject matter either of the original action or of a counterclaim therein. Such cross-claim may include a claim that the party against whom it is asserted is or may be liable to the cross-claimant for all of part of a claim asserted in the action against the cross-claimant (Sec. 8, Rule 6).