Wiktionary
n. 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. 2 (context by synecdoche English) A woman with small breasts.
Usage examples of "a cup".
Tossing aside the magazine and with a cup of coffee in one hand she went to answer.
She got up from the bed, went back into the lounge to get a cup of hot chocolate from the autochef, and tried to fathom why.
One of the night porters on my decka very nice man named Haffizwill make me a cup of tea if I come to his service cubicle, and we have a nice talk.
The travellers fell greedily upon the food, but Jock contented himself with a cup of tea and a new-baked scone.
He put Alastair in a chair and fed him tenderly, beating up an egg in a cup with French brandy.
He helped himself to a cup of coffee and talked business with Dennis while I finished packing our bags, made the beds, and slipped into a suit.