- a sudden and destructive rush of water down a narrow gully or over a sloping surface, caused by heavy rainfall.
Origin of flash flood
First recorded in 1935–40
SynonymsSee more synonyms for flash flood on Thesaurus.com
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a sudden short-lived torrent, usually caused by a heavy storm, esp in desert regions
- A sudden, localized flood of great volume and short duration, typically caused by unusually heavy rain in a semiarid area. Flash floods can reach their peak volume in a matter of a few minutes and often carry large loads of mud and rock fragments.
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