Positive meaning
A dream about decayed things may symbolize a process of transformation. It might indicate that you are releasing old patterns in your life and opening yourself up to new possibilities that will move you forward.
Negative meaning
Decay in dreams may reflect your fear of failure or disappointment. You might feel that something in your life is out of control and you worry it will affect your relationships or goals.
Neutral meaning
A dream about decayed things might just be a reflection of everyday life, where you encounter problems and challenges. It could be a signal for you to think about what needs to be repaired or improved in your surroundings.