Definition of shirtsleeve noun from the Oxford Advanced Learner's Dictionary

 

shirtsleeve

 noun
noun
BrE BrE//ˈʃɜːtsliːv//
 
; NAmE NAmE//ˈʃɜːrtsliːv//
 
[usually plural]
 
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  • a sleeve of a shirt He rolled up his shirtsleeves.
  • Idioms wearing a shirt without a jacket, etc. on top of it It was a hot day and most of the men were in shirtsleeves.
    See the Oxford Advanced American Dictionary entry: shirtsleeve