down draft

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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