WordReference Random House Unabridged Dictionary of American English © 2020
dive brake′, [Aeron.]
  1. Aeronauticsa flap deployed from the wings or fuselage of an aircraft, as a dive bomber or sailplane, that increases drag to permit a relatively steep angle of descent without a dangerous buildup in speed.
  • 1935–40

'dive brake' also found in these entries (note: many are not synonyms or translations):
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