Definition of “grand slam” - English Dictionary

“grand slam” in American English

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grand slamnoun [ C ]

/ˈɡrænd ˈslɑm/

grand slam noun [ C ] (BASEBALL)

in baseball, the hitting of a home run with runners at all three bases, so that four points are scored

grand slam noun [ C ] (TENNIS AND GOLF)

in tennis and golf, the act of winning all of a series of important competitions

(Definition of “grand slam” from the Cambridge Academic Content Dictionary © Cambridge University Press)