From Longman Dictionary of Contemporary Englishfoursomefour‧some /ˈfɔːsəm $ ˈfɔːr-/ noun [countable] GROUP OF PEOPLEa group of four people, especially two men and two women, who come together for a social activity or sport Jim and Tina made up a foursome with Jean and Bruce.
Examples from the Corpus
foursome• On the golf-course behind him a foursome of players shouted to one another as they approached the fourteenth green.• We have to rush to join the others in our foursome.• It was typical poor foursomes golf.• It makes for a strange foursome.• With amazing simplicity the foursome was complete. 