Dormancy is a status that allows you to mark a newsletter is inactive and turns off most major pieces of functionality without having to actually delete your data or change any major configurations. While your newsletter is dormant, you won't be billed for anything, and you can wake your newsletter from hibernation with a single button click.
There are a few reasons you might want to mark your newsletter as dormant:
Notably, dormant newsletters do not keep their archives accessible, nor can new subscribers join. (If you're interested in taking a break from your newsletter but want to keep it accessible, you can pause your subscription instead.)
Just head to the Danger Zone and click "Mark as dormant".