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Meaning of sweepback

sweep•back

Pronunciation: (swēp'bak"), [key]
— n. Aeron.
  1. the shape of, or the angle formed by, an airplane wing or other airfoil the leading or trailing edge of which slopes backward from the fuselage.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.