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flash floodalso flash·flood (flăsh′flŭd′)
A sudden flood of great volume, usually caused by heavy rain.
(Physical Geography) a sudden short-lived torrent, usually caused by a heavy storm, esp in desert regions
a sudden rush of water down a narrow gully or over a sloping surface, caused by heavy rainfall.
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|Noun||1.||flash flood - a sudden local flood of great volume and short duration|
flood, inundation, alluvion, deluge - the rising of a body of water and its overflowing onto normally dry land; "plains fertilized by annual inundations"
floodhead - a wall of water rushing ahead of the flood; "we were lucky to be safe when the floodheads hit"