ˌgrand ˈslam 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 tricks possible in one game of cards, especially in bridge

[TahlilGaran] Dictionary of Contemporary English ▲

grand slam
n. A home run hit when there are three men on the bases.
Tony's grand slam won the game for the Yankees, 4-0.

[TahlilGaran] English Idioms Dictionary ▲