A more thorough explanation:

Definition: Double possession is a legal concept that refers to the idea that both the person who owns something and the person who is holding it have possession of it. Possession means having control over something and being able to use it exclusively.

Example: A person who borrows a car from a friend has double possession of the car. The owner of the car still owns it, but the borrower has possession of it while they are using it.

This concept is important in bailment law, which deals with situations where one person gives another person temporary possession of something. In most Anglo-American jurisdictions, the person who has possession of the item is considered the sole possessor, not both parties.