/'fɔ:səm; `fɔrsəm/
n
1 four people joining together to play a game, esp golf 四人参加的游戏（尤指高尔夫球）.
2 two couples undertaking a leisure activity together 两对男女一同参加的娱乐活动
*Let's make (up) a foursome and go out to a restaurant. 咱们四个人（两对男女）一起下饭馆吧.

n[C]
a 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.