ˌgrand ˈslam BrE AmE noun [countable]
1 . ( also Grand Slam ) the winning of all of a set of important sports competitions in the same year:
Wales won the Grand Slam.
2 . a hit in ↑ baseball which gets four points because it is a ↑ home run and there are players on all the bases
3 . the winning of all of the ↑ trick s possible in one game of cards, especially in ↑ bridge