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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
British Dictionary definitions for sweepback
the rearward inclination of a component or surface, such as an aircraft wing, fin, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012