noun
1.
(also Grand Slam ) a very important sports event, contest, etc. :
a Grand Slam tournament / cup / title
2.
the winning of every part of a sports contest or all the main contests in a year for a particular sport :
Will France win the grand slam this year? (= in rugby )
3.
(also grand ˌslam home ˈrun ) ( in baseball ) a home run that is worth four points
4.
( in card games, especially bridge ) the winning of all the tricks in a single game
For more information see the Cultural Guide
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WORD ORIGIN
early 19th cent. (as a term in cards, especially bridge).