The site’s owner or an administrator can delete the site and any pages attached to it. Deleting a site will also delete the site’s core team group and content group.
Note:
To delete an individual page, see Delete a page.
- Open a site in edit mode.
 - Click the more button 
 and choose Delete Site. - Review the Deleting a site message and click Next.
 - Click Next and provide the site's URL in the safety confirmation field.
 - Click Confirm Deletion.