Definition from Wiktionary, the free dictionary
downpour (plural downpours)
- a heavy rain
- They got caught in a downpour without an umbrella and came back soaked.
- (intransitive) To pour down; rain heavily.
2002, Patricia Koretchuk, Chasing the comet: a Scottish-Canadian life - Page 211:
- It started to downpour, so Billy and I made our way back to our house, with Scotty following—or so I thought.