A cockroach that hisses when disturbed stands for a protest made loudly by something small — defensiveness in a creature that only wants to be left alone.
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.