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1. In the card game bridge, the winning of all thirteen tricks on one deal of the game. I've been playing bridge for years, but I've still never been able to make a grand slam.
2. In baseball, a homerun that is achieved when all three bases have runners on them. It looked like the home team was in for a sure loss, but a grand slam at the last minute edged them ahead of their opponents.
3. (sometimes capitalized) In sports, the winning of all major championships or tournaments in a single year, especially in tennis or golf. The young player shocked the tennis world by winning a Grand Slam in her first year at the professional level.
4. By extension, any total, sweeping victory or success. With the Ohio votes in her favor, it looks like the new president has managed a grand slam.
A sweeping success or total victory, as in This presentation gave us a grand slam-every buyer placed an order. This term originated in the early 1800s in the card game of whist (forerunner of contract bridge), where it refers to the taking of all thirteen tricks. It later was extended to bridge and various sports, where it has different meanings: in baseball, a home run hit with runners on all the bases, resulting in four runs for the team; in tennis, winning all four national championships in a single calendar year; in golf, winning all four major championships. In the 1990s the term was used for four related proposals presented on a ballot at once.