"Hull-up" means to bring a vessel to an upright position. Some synonyms for this word include righting, upending, overturning, capsizing, or leveling. Each of these words describes the process of setting a vessel upright, whether it be after a storm or other disturbance on the water. "Righting" is a more general term to describe the process of turning something upright, while "upending" is more specific to turning something from its bottom to its top. "Capsizing" is a term commonly used to describe a vessel that has tipped over completely. Regardless of the term used, the goal is always to bring the vessel back to a stable and safe state.