Definition of flash flood noun from the Oxford Advanced Learner's Dictionary

 

flash flood

 noun
noun
BrE
 
; NAmE
 
Rain, Natural disasters
 
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a sudden flood of water caused by heavy rain More than 80 people were feared dead last night after flash floods, the worst in 34 years. Wordfinderdownpour, drought, flash flood, monsoon, precipitation, puddle, rain, shelter, shower, squall See related entries: Rain, Natural disasters
See the Oxford Advanced American Dictionary entry: flash flood