A cave-in is read as pressure from above finally giving way — a feeling of being trapped or cut off. It describes an inner sense of strain and the wish for a way out, not a literal event.
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.