The term 'of rain' can be summarized by the crossword solutions 'fall heavily' and 'POUR'. Rain is a form of precipitation that occurs when water droplets condense in the atmosphere and fall to the ground. It is an important part of the water cycle, providing water for plants and animals. Heavy rain is a type of rain that falls in large amounts over a short period of time. It can cause flooding and other damage. Pouring rain is a term used to describe a heavy downpour of rain.