Pronunciation: (fôr'sum, fōr'-),[key] —n. 1. a company or set of four; two couples; a quartet: to make up a foursome for bridge. 2. Golf. a. a match between two pairs of players, each of whom plays his or her own ball.
b. Also calledScotch foursome. a match between two pairs of players, in which each pair plays one ball and partners stroke alternately.
—adj. consisting of four persons, things, etc.; performed by or requiring four persons.