Definition of A-shirt in US English:

noun

• A sleeveless athletic shirt or undershirt.

  Example sentences

  • ‘He changed into a pair of shorts and a plain white A-shirt before he went to the lesson rooms.’
  • ‘The mechanic usually walked around in her work clothes - overalls, A-shirts, jeans, whatever she could find that she wouldn't mind getting messy - and lounging around the ward in that ensemble would be like bringing poison into the room.’
  • ‘Alex put on a white A-shirt and zipped up his backpack, ‘Look man, I don't know.’