A cup

A cup (plural A cups)

1. A standard, relatively small, bra cup size, consisting of a measurement around the bust that is one inch longer than a measurement around the band, plus five inches.
   • 1999, Elizabeth M. Hoekstra, M. Beth Cutaiar, Just for Girls‎:

     The smallest cup size is AAA. The largest is a DD/E. An A cup is fairly small, just a little swell of breast tissue.

2. (by synecdoche) A woman with small breasts(of this cup size).
   • 2003, Michelle Copeland, Change Your Looks, Change Your Life, →ISBN:

     "Gabrielle had always been an A cup, but her pregnancy had left her breasts flat as pancakes, and she wanted to go to a C cup and eliminate some of the sag."

   • 2004, Z Paul Lorenc, Trish Hall, A Little Work‎:

     Directly after Julia is Patricia, who, oddly enough, is another young blond mother from the suburbs. She, too, is an A cup wanting breast implants.

• Cupa, Puac, caup, pacu