A more thorough explanation:

Definition: The recoveror is the demandant who obtains a judgment in a common recovery. A common recovery is an old legal proceeding that allowed a tenant in tail to disentail a fee-tail estate. It was a complicated process full of legal fictions that facilitated land transfer by allowing a potential transferee who was barred by law from receiving land to "recover" the land by suing the actual owner. The common recoveries were abolished in the early 19th century.

Example: In a common recovery, B would bring a real action against A, claiming falsely that he owned the land and demanding recovery of it. A would respond by claiming, just as falsely, that he had acquired the land from C and that C had warranted title to the land. When A demanded that C defend the title, C admitted falsely that he had warranted the title. C allowed B to take a default judgment against A for the recovery of the land, and allowed A to obtain a default judgment against himself, C, for the recovery of land of equal value. The result of this fancy feudal footwork was to leave B with title to the land in fee simple and to leave A with his judgment against C.

Explanation: The example illustrates how a common recovery worked. It was a complicated process that involved collusion between the parties to transfer land from one person to another. The recoveror was the person who obtained a judgment in the common recovery, which allowed them to take title to the land in fee simple.