game changerEnglishOxford Dictionary of Englishgame changer /ˈɡeɪm ˌtʃeɪn(d)ʒə / ▸ noun an event, idea, or procedure that effects a significant shift in the current way of doing or thinking about something: a potential game changer that could revitalize the entire US aerospace industry. – DERIVATIVES game-changing /ˈɡeɪmˌtʃeɪn(d)ʒɪŋ / adjective