Standing on the edge of a cliff could be a frightening, but at the same time an exhilarating experience. Dreaming about cliffs generally indicates that the dreamer has come to a point of heightened understanding and awareness.
An increase in the level of consciousness may have occurred. Through hard work and perseverance, the dreamer may have reached a vantage or plateau of understanding.... The Bedside Dream Dictionary
This signifies the decay of a great family fortune which will affect you indirectly, whether it be Rotten fruit or timber, but should the dream be of Rotten cliffs which crumble as you climb them, guard your health most carefully.... Mystic Dream Book