Rappelling down a cliff stands for a controlled descent, letting yourself down from a height step by step. Dream books read it as stepping back from a high position on your own terms.
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.