Oxford Dictionary English flash flood noun noun BrE BrE//ˈflæʃ flʌd// ; NAmE NAmE//ˈflæʃ flʌd// Rain, Natural disasters Add to my wordlistjump to other resultsa 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. Wordfinderraindownpour, drought, flash flood, monsoon, precipitation, puddle, rain, shelter, shower, squall See related entries: Rain, Natural disastersSee flash flood in the Oxford Advanced American DictionaryCheck pronunciation: flash flood oxfordlearnersdictionaries.com