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English definition of “one-upmanship”

one-upmanship

noun [U] /ˈwʌnˈweɪ/ (also one-upsmanship,  /ˈwʌnˈʌps·mənˌʃɪp/)
an effort to show that you are better than someone you are competing with: We heard the usual boasting and one-upsmanship before the boxers entered the ring.
(Definition of one-upmanship from the Cambridge Academic Content Dictionary © Cambridge University Press)
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