torrent

A violent flow, as of water, lava, etc.; a stream suddenly raised and running rapidly, as down a precipice.

Rain fell on the hills in torrents.

A torrent of green and white water broke over the hull of the sail-boat.

A large amount or stream of something.

They endured a torrent of inquiries.

The wind was a torrent of darkness among the gusty trees, / The moon was a ghostly galleon tossed upon cloudy seas, / The road was a ribbon of moonlight over the purple moor, / And the highwayman came riding— / Riding—riding— / The highwayman came riding, up to the old inn-door.

Rolling or rushing in a rapid stream.

Waves of torrent fire.

To fall or flow in a torrent; to pour.

... through the inflexible rain, each turn in the track revealed a new cascade, torrenting down the steep cliff of the hill. The weather was too wild for me to get to them. In good weather, they wouldn't exist.

Outside[,] rain was torrenting down, lightning and thunder heralded the arrival of a summer storm.