downdraft

[doun-draft, -drahft]
noun
1.
a downward current, as of air: a downdraft in a mine shaft.
2.
a downward movement, as of the stock market.

Origin:
1780–90; down1 + draft

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
downdraft   (doun'drāft')  Pronunciation Key 
A downward moving current of air in a cumulonimbus cloud. Compare updraft.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At the same time, a powerful downdraft pushed rain and hail to the ground.
The air in the downdraft wrapped around the air in the updraft.
At the same time, a cooler downdraft pushed rain and hail to the ground.
Powerful downdraft machines are promised to suck the usual smoke and cooking
  smells out through the floor.
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