These are English terms that mean big hit or grand hit. In the Sport of Tennis is the way to call the 4 biggest tournaments of this sport : Australia, Roland Garros, Wimbledon and U.S. Open. It's a term taken from the bridge game. It's a move that gets 1000 additional points with 13 bases if you're not vulnerable and 1500 if you're vulnerable. The term grand slam is also used in baseball, to indicate a home run with all bases full which means 4 runs.
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