To fully understand the concept of rain, I decided to do some initial research into the meaning, and various phrases that are used to represent rain. Here are some of my findings:
Definition from Oxford Dictionary.
Rain noun
the plants were washed away by unusually heavy rains
he fell under the rain of blows
verb
the low sky raining over tower’d Camelot
Phrases
be as right as rain
be perfectly fit and well:- she’ll be right as rain in a couple of days
it never rains but it pours
rain very hard.
rain cats and dogs
- [origin uncertain; first recorded in 1738, used by Jonathan Swift, but the phrase rain dogs and polecats was used a century earlier in Richard Brome's The City Witt]
rain on someone's parade
- informal prevent someone from enjoying an event; spoil someone’s plans.
(come) rain or shine
- whether it rains or not; whatever the weather: be rained off (or North American out)
- (of an event) be cancelled or terminated because of rain:the match was rained off
- he runs six miles every morning, rain or shine