Crossed fingers are read as hope held quietly, with no certainty behind it. Dream books see the gesture as wanting something badly while admitting it is out of your hands.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.