Legal Definition of Ensue: To follow or to come later. When one is given a large dose of sleeping pills, sleep ensues. The word implies that there is a direct connection between a certain act and what follows said act | Understanding the Legal Definition of Ensue: Learn the importance of ensue in legal cases and how it establishes a cause-and-effect relationship between actions and their consequences. Discover how this knowledge can empower business owners to navigate the legal landscape and protect their interests