"foursomes" in the noun sense
1. quartet, quartette, foursome
four people considered as a unit
"he joined a barbershop quartet"
"the foursome teed off before 9 a.m."
2. four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
the cardinal number that is the sum of three and one
Source: WordNet® (An amazing lexical database of English)
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