Answer: Consider for example, a liquid water at 20°C and 1 atm pressure. Under these conditions, water exists in the liquid phase, and it is called a compressed liquid, or a subcooled liquid, meaning that it is not about to vaporize.
Therefore, the substance in the liquid phase well below the saturation point is called subcooled liquid. This liquid phase is not suddenly going to change into a vapor phase. (Exception: Critical point)