Wiktionary
n. 1 In a tournament, raffle or other contest, the most desirable prize offered for the overall winner. 2 First prize.
Usage examples of "grand prize".
Not the grand prize, which was getting to be the Brew Crew's batboy for the entire Cincinnati series, but what he got (besides this excellent seat with the other winners, that is) is, in his opinion, even better.
Fred and Willy were overwhelmed at the strength of the furry quadrupeds and especially interested to note that the handler of the heavyweight Grand Prize winner had unconsciously exercised a telepathic rapport with his dog, aiding its performance.
Ten thousand dollars is the grand prize, to be awarded for the quickest flight on record.
Defeat had never been sweeter, because he'd come away with the grand prize.
At the moment his grand prize was bruised and half-naked, but still valiant He released her with a little swat to her bare backside.
They both agreed that Athena Aquitane would be a grand prize if she ever gave them an opening.
I hastily buried the Grand Prize in Eighteen and began raking it over.