From Longman Dictionary of Contemporary Englishbig gameˌbig ˈgame noun [uncountable] HBADSOlarge wild animals hunted for sport, such as lions and elephants a big game hunter
Examples from the Corpus
big game• It's all a big game.• He says it's a big game for me and the club.• We still have one big game left before the Super Bowl.• Try saying big glass as you would say big game and then as you would say big deal.• Heupel lost out on the Heisman Trophy, finishing runner-up to Weinke, but he won the big game that mattered.• This was a very big game.• It's got to the point where manager Lennie Lawrence must wake up at times wondering which big game is next. 