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1. A short, tight-fitting jacket, traditionally worn by sailors.
2. See mess jacket.
[From its resemblance to the jacket worn by an organ grinder's monkey.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Clothing & Fashion) a short close-fitting jacket, esp a waist-length jacket similar to a mess jacket
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a close-fitting, waist-length jacket worn by men esp. as part of a uniform.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.