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flash flood

noun
1.
a sudden and destructive rush of water down a narrow gully or over a sloping surface, caused by heavy rainfall.
Origin
1935-1940
1935-40
Synonyms
See flood.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for flash-flood

flash flood

noun
1.
a sudden short-lived torrent, usually caused by a heavy storm, esp in desert regions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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flash-flood in Science
flash flood
  (flāsh)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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11
11
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