De-hydrating is a term that refers to the process of removing water from something or someone. The antonym of de-hydrating is rehydrating, which means to restore or replenish the water content of something or someone. Rehydration is important for maintaining the proper functioning of the body, as it helps to regulate body temperature, transport nutrients and eliminate waste. Other antonyms of de-hydrating include hydrating, moisturizing, and watering. These terms all focus on the act of adding water to something, whether it be skin, plants or food. Ensuring you consume sufficient water or rehydrate after exercise is vital to avoid dehydration.