Game changer = something that creates a sea change, a revolutionary change in such a situation or in the conditions for a future similar situation. Game Changer A professor in Pennsylvania makes a calculation and discovers that his state is sitting atop a massive reserve of natural gas—enough to revolutionize how America gets its energy. The expression “game changer” has been used to describe the entry of former corruption investigator and Montreal police chief Jacques Duchesneau into provincial politics.
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