A cup noun 2A-cup adjective 1forms 1 noun2 •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.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. — 1999 •A woman with small breasts (of this cup size)."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." — 2003 A-cup adjective1 •Sized so as to fit an A cup.That A-cup bra might fit better. formsA cups
