- 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 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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