Dungeon World Companion

Recover

Special move

Trigger
When you do nothing but rest in comfort and safety
Roll
Not rolled

Full text

When you do nothing but rest in comfort and safety after a day of rest you recover all your HP. After three days of rest you remove one debility of your choice. If you’re under the care of a healer (magical or otherwise) you heal a debility for every two days of rest instead.

Read it in the rules: Recover