sweepback

[ sweep-bak ]
/ ˈswipˌbæk /

noun Aeronautics.

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.

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Origin of sweepback

First recorded in 1915–20; noun use of verb phrase sweep back
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for sweepback

sweepback
/ (ˈswiːpˌbæk) /

noun

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