A great flood or rain.

“The deluge continued for hours, drenching the land and slowing traffic to a halt.”

An overwhelming amount of something; anything that overwhelms or causes great destruction.

“The rock concert was a deluge of sound.”

(military engineering) A damage control system on navy warships which is activated by excessive temperature within the Vertical Launching System.

To flood with water.

“Some areas were deluged with a month's worth of rain in 24 hours.”

To overwhelm.

“After the announcement, they were deluged with requests for more information.”