A more thorough explanation:

Definition: Plaintiff in error is an archaic term that refers to a person or party who appeals a court decision or files a petition for review.

Example: If a person sues another person and loses the case, they may choose to become the plaintiff in error and appeal the decision to a higher court.

Explanation: The example illustrates how a person who is not satisfied with the outcome of a court case can become the plaintiff in error and appeal the decision. This term is used in legal contexts and is important for understanding the appeals process.