Subrogation

n. substitution of one creditor for another

Subrogation is the legal technique under the common law by which one party, commonly an insurer (I-X) of another party (X), steps into X's shoes, so as to have the benefit of X's rights and remedies against a third party such as a defendant (D). Subrogation is similar in effect to assignment, but unlike assignment subrogation can occur with any agreement between I-X and X to transfer X's rights. Subrogation most commonly arises in relation to policies of insurance, but the legal technique is of more general application. Using the designations above, I-X (the party seeking to enforce the rights of another) is called the subrogee. X (the party whose rights the subrogee is enforcing) is called the subrogor.
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Noun
1. (law) the act of substituting of one creditor for another
(hypernym) substitution, exchange, commutation
(derivation) subrogate
(classification) law, jurisprudence

n. subrogation, substitution of one creditor for another

(n.)
The substitution of one person in the place of another as a creditor, the new creditor succeeding to the rights of the former; the mode by which a third person who pays a creditor succeeds to his rights against the debtor.
  

(n.)
The act of subrogating.