A more thorough explanation:

Definition: Quarto die post (kwor-toh dI-ee pohst) is a legal term that means "on the fourth day after." It refers to the defendant's appearance day, which is four days (inclusive) from the return of the writ.

Example: If a writ is returned on Monday, the quarto die post would be Friday, which is the day the defendant is required to appear in court.

Explanation: This legal term is used to specify the deadline for a defendant to appear in court after the return of a writ. The quarto die post is always four days after the return of the writ, including the day the writ was returned. For example, if a writ is returned on Monday, the quarto die post would be Friday, which means the defendant must appear in court on that day. This term is important in legal proceedings to ensure that all parties involved have a clear understanding of when they are required to appear in court.