pipe dream

The phrase "pipe dream" is commonly used to describe an idea, plan, or goal that is impossible to achieve or highly unlikely to happen. It refers to an unrealistic or fanciful concept that may be captivating or appealing but lacks feasibility or practicality. The origin of the term comes from the notion of smoking opium, where a person indulging in the drug might have unrealistic and fantastic visions while in a dreamlike state, similar to the nature of a pipe dream.