zero-sum game
noun/ˌzɪərəʊ sʌm ˈɡeɪm/
/ˌzɪrəʊ sʌm ˈɡeɪm/
- a situation in which what is gained by one person or group is lost by another person or group
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zero-sum game
Definition of zero-sum game noun from the Oxford Advanced Learner's Dictionary