A single wing is read as the potential to rise and the means of carrying yourself forward. Its state in the dream — strong, folded or spread — is taken as how ready you feel to move.
Has this come up in your dreams before? What was going on in your life then?
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.