A funnel narrows many things into one stream, so dream books read it as focus, channelling energy or being pushed toward a single path. It can also stand for feeling narrowed in.
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.