Blackmail is read as feeling trapped by a secret or controlled by someone else’s leverage. Tradition sees it as fear of exposure and pressure to comply.
Does the traditional reading fit your dream, or did it mean something else to you?
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.