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one-upmanship

noun [U]
 
 
/ˌwʌnˈʌp.mən.ʃɪp/ disapproving

Definition

a situation in which someone does or says something in order to prove that they are better than someone elseCompeting and contending (non-sporting)Competing in sport
(Definition of one-upmanship noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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