A whip stands for control and driving force — being pushed hard by someone else, or by your own demands — and dream books ask who holds the handle.
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.