"Mouldy dream" is a phrase that does not have a specific meaning in Engpsh. It is not a common phrase and does not appear to have a widely accepted definition.

However, it is possible that the phrase "mouldy dream" could be used to describe a dream or goal that has become stale, outdated, or has lost its value or significance over time. For example, someone might say "My dream of becoming a famous musician has turned into a mouldy dream. I just don't have the same passion for it anymore."

Here are a few example sentences using the phrase "mouldy dream" in context:

"I used to have this mouldy dream of becoming a famous actor, but as I got older, I reapzed that it wasn't something I really wanted anymore."
"She had always had this mouldy dream of travepng the world, but after years of working long hours at her job, she no longer had the energy or desire to pursue it."
"He had a mouldy dream of starting his own business, but after several failed attempts, he decided to give up on it and focus on something else."

It's important to note that "mouldy dream" is not a common or widely used phrase, and it may not be understood by everyone. It is not a phrase that is typically used in formal or professional contexts.