Meaning of best-ball foursome

best'-ball' four"some

Pronunciation: (best'bôl'), [key]
— Golf. Golf.
  1. a match, scored by holes, between two pairs of players, in which the score of the lower scoring member of each pair is taken as their score for the hole.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.