When something secerns, it separates or releases a liquid from a part of the body.
When something secerns, it is a normal and natural process in the body.
Examples:
The flower secerns a sweet smell.
The body secerns sweat when it's hot.
The tree secerns a sticky sap.
The fruit secerns juice when you squeeze it.
The candle secerns wax as it melts.
The nose secerns mucus when you have a cold.