A check is read as a promise of value written on paper. Dream books link a bouncing one to fears of being let down, and a large one to the hope of reward for effort.
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.