Over-explaining occurs when a writer provides excessive detail or clarification, which can dilute the impact of the story and frustrate the audience. In the context of crafting short synopses, over-explaining leads to convoluted summaries that fail to engage readers, making it difficult for them to grasp the core essence of the story. This term highlights the importance of brevity and clarity, ensuring that every word serves a purpose in effectively communicating the narrative's key elements.