foursome

plural foursomes

1. A group of four, a quartet or a game (such as golf) played by four players, especially by two teams of two.

   Also, since the players teed off simultaneously, the infamous "shotgun start," with several foursomes at each tee box, the tournaments ran notoriously slow.

   2011 October, Mike Nettleton, Shotgun Start, Krill Press, →ISBN

   2 more examples

   The fired-up foursome takes itself very seriously, singing politically charged lyrics, which, in the tradition of Strife and Damnation AD, are strategically placed in the middle of slamming, moshable breakdowns.

   1999, CMJ New Music Report, volume 59, number 631, page 28

   And Ms. Davies’s 7,000-square-foot guesthouse, the only building from the original estate to survive, is already a favorite among card-playing foursomes and others who want to lounge on the second-story deck and watch dolphins bob in the whitecapped waves.

   2009 August 30, Laura M. Holson, “A Dip Into Hollywood”, in The New York Times

   Synonyms: quaternion

2. A sex act between four people.

   Synonyms: fourgie