a strong downward current of air from a cumulonimbus cloud, often associated with intense thunderstorms.

down1 + burst Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
downburst (ˈdaʊnˌbɜːst)
Also called: microburst a very high-speed downward movement of turbulent air in a limited area for a short time. Near the ground it spreads out from its centre with high horizontal velocities

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
downburst   (doun'bûrst')  Pronunciation Key 
An extremely powerful downward air current from a cumulonimbus cloud, typically associated with thunderstorm activity. Downbursts can produce effects that resemble those brought about by tornadoes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Downburst winds can smash buildings and easily uproot trees and are often
  mistaken for tornadoes.
In some cases, these visual cues may be the only significant clue that a
  downburst is imminent.
The output from the algorithm indicates either a prediction or detection of a
  downburst event and an estimate of its strength.
The hail swath is nearly parallel to the swath of damaging downburst winds.
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