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speed brake

noun
1.
a flap on an aircraft wing used to decrease speed in flight in preparation for landing.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for speed brake
  • Information on speed brake operations during flight was determined to be of primary interest to various users of the data.
  • The speed brake lever, located on the pilot's control wheel, was found in the stowed position.

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