Short-lived stage is a term used to describe a period of time that is relatively brief in comparison to other stages. It is often used to refer to a period of development or transition, such as a PHASE in a project or a stage in a person's life. The term can also be used to describe a period of time in which something is popular or fashionable, but quickly fades away. In the context of a crossword puzzle, the term PHASE is a five letter word that can be used to describe a short-lived stage.