How did Duke Zhou dream of finger bleeding?

Finger bleeding is the loss of wealth in your hands and a heavy blow to your life. This is usually explained as accidental loss, money being cheated, and the amount is huge enough to endanger existing lives.

Psychological explanation of dreaming of hands;

The hand is the most prominent part of the human body and a symbol of strength and creativity. The dream hand is a symbol of success or failure in life and career. Fingers depend on the palm of your hand, and the fingers in your dream represent your personal life supported by your career. Seeing the hand or finger cut off means that the dreamer will lose the most precious thing.