Pronunciation: (shûrt'slēv"), [key]
1. not wearing a jacket; informally dressed: a shirt-sleeve mob.
2. warm enough to live or work in without wearing a jacket or coat: shirt-sleeve weather in November.
3. simple, plain, and informal; direct and straightforward in approach, manner, etc.: shirt-sleeve diplomacy. Also,shirt'sleeve",shirt'-sleeved",shirt'-sleeves".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.