A "recurring dream" is one that you have over and over again. It's usually one particular situation that you've dreamed about several times. Some unlucky people have a "recurring nightmare", which is a frightening dream that they have again and again.
The word "recurring" means "happening again and again in the same way". It's also used in these phrases:
- A recurring theme in a novel is an idea which keeps appearing throughout the book.
- When an actor has a recurring role on a TV show, it means that they keep coming back on the show to play the same character.