[doun-pawr, -pohr]
a heavy, drenching rain.

1805–15; down1 + pour Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
downpour (ˈdaʊnˌpɔː)
a heavy continuous fall of rain

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1811, from down (adv.) + pour.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It all ended in rain-a downpour on shore that erased all of it so quickly.
For fifteen minutes it showered down beams of light, giving the effect of a
  downpour of rain.
Shortly after the discovery of the vehicle, a heavy downpour of rain began
  which hampered investigative and search efforts.
All it takes is a torrential downpour or a sustained period of rain.
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