When you no longer require a website, you can unpublish the site. You will be able to republish this site at a later date, if needed.
To do this, follow the steps given below:
Go to Configuration -> Site Options.
Select Preferences.
Click Unpublish under Unpublish.
Click Unpublish in the pop-up. Your site will be pulled down.

Unpublished websites are not accessible to visitors.