Oxford Dictionary English shirtsleeve noun noun BrE BrE//ˈʃɜːtsliːv// ; NAmE NAmE//ˈʃɜːrtsliːv// [usually plural] Add to my wordlistjump to other resultsa sleeve of a shirt He rolled up his shirtsleeves.Idioms in (your) shirtsleeves Add to my wordlistjump to other resultswearing a shirt without a jacket, etc. on top of it It was a hot day and most of the men were in shirtsleeves.See shirtsleeve in the Oxford Advanced American DictionaryCheck pronunciation: shirtsleeve oxfordlearnersdictionaries.com