A more thorough explanation:

Definition: Something done as a part of a routine process or procedure.

Examples:

• It is a matter of course for the doctor to check your blood pressure during a routine physical exam.
• As a matter of course, the teacher takes attendance at the beginning of each class.
• It is a matter of course for the chef to wash their hands before preparing food.

The examples illustrate that a matter of course is something that is done automatically or without much thought because it is a standard part of a process or procedure. Just like how a doctor checks your blood pressure during a physical exam, or a teacher takes attendance at the beginning of class, these actions are expected and routine. Similarly, a chef washing their hands before preparing food is a matter of course because it is a necessary step in ensuring food safety.