batwing

[bat-wing]

adjective

formed, shaped, etc., like the wing of a bat.
(of a garment or part of a garment) resembling or conceived of as resembling the wing of a bat, as a loose long sleeve (batwing sleeve) having a deep armhole and a tight wrist.

Origin of batwing

First recorded in 1955–60; bat² + wing

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for bat-wing sleeve

batwing

adjective

shaped like the wings of a bat, as a black tie, collar, 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