(lĕg′ə-mŭt′n, lĕg′əv-) or leg-o'-mut·ton (lĕg′ə-)
Resembling a leg of mutton in shape; tapering sharply from one large end to a point or smaller end, as a sleeve or sail.
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) (modifier) (of a sail, sleeve, etc) tapering sharply or having a triangular profile
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


or leg′-o'-mut′ton,

1. having the triangular shape of a leg of mutton: a leg-of-mutton sail.
2. (of the sleeve of a dress or blouse) full and puffed from shoulder to elbow and then tightly fitted from elbow to wrist.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
Then I removed the sprit, tightly hauling down the peak of the sail, and we raced along under what sailors call a leg-of-mutton.
Think pretty Poet's sleeves, billowing bishop's sleeves and gigot sleeves (also called the leg-of-mutton sleeve).
That commanding pinstripe was seen on chiffon leg-of-mutton sleeves on slim fitting, buttoned-up dresses trailing untied pussy bows, or in wool in a feminine take on the three piece suit.
Among the garments from the late 1800's and early 1900's is an off-white satin print dress with trim and bows and "leg-of-mutton" sleeves.
The painting displays a subtle richness of color in the iridescent salmon-hued leg-of-mutton sleeve of the mother's dress and the delicate fabric clothing of the auburn-haired baby.
Designer Icarius makes bold statement with golden yellow and white jacket with leg-of-mutton sleeves and one oversized lapel, worn over yellow blouse and matching bikini shorts.
LET ME START OUT BY NAILING MY colours to the mast: I'm a lapstrake dory man; leg-of-mutton sail, centreboard and protected waters, Whenever the swell gets above about a half-metre, I'm in the club reading CS Forester or Patrick O'Brian.
His is an Anglicized, leg-of-mutton realism, not unlike that of Stanley Spencer: the nude is reduced to edible (if still Oedipal) plain food.