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sweptback

[swept-bak]
adjective Aeronautics.
  1. (of the leading edge of an airfoil) forming a markedly obtuse angle with the fuselage.
  2. (of an aircraft or winged missile) having wings of this type.
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Origin of sweptback

First recorded in 1915–20; adj. use of verb phrase swept back
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sweptback

sweptback

adjective
  1. (of an aircraft wing) having leading edge and trailing edges inclined backwards towards the rear of the fuselage
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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