A sinkhole opening underfoot is read as the fear that the ground you trusted is not solid. Dream books link it to hidden problems surfacing all at once.
Has this come up in your dreams before? What was going on in your life then?
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.