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one-upmanship

[wuhn-uhp-muh n-ship]
noun
  1. the art or practice of achieving, demonstrating, or assuming superiority in one's rivalry with a friend or opponent by obtaining privilege, status, status symbols, etc.: the one-upmanship of getting into the president's car pool.
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Also one-ups·man·ship [wuhn-uhps-muh n-ship] /ˈwʌnˈʌps mənˌʃɪp/.

Origin of one-upmanship

First recorded in 1950–55; one up + -manship
Also called upmanship, upsmanship.

upmanship

[uhp-muh n-ship]
noun
  1. one-upmanship.
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Also ups·man·ship [uhps-muh n-ship] /ˈʌps mənˌʃɪp/.

Origin of upmanship

First recorded in 1960–65; shortening of one-upmanship
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for upsmanship

one-upmanship

noun
  1. informal the art or practice of achieving or maintaining an advantage over others, often by slightly unscrupulous means
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012