Definition of foursome noun from the Oxford Advanced American Dictionary

 

foursome

 noun
noun
NAmE//ˈfɔrsəm//
 
 
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a group of four people taking part in a social activity or sport together Can you make up a foursome for tennis tomorrow? We used to go around together as a foursome. The Chicago-based foursome is due to tour Europe this summer.
See the Oxford Advanced Learner's Dictionary entry: foursome