An angry mob is read as collective pressure and fear of being judged by many at once. Tradition links it to losing your own voice in the noise of a group.
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.