Etymology
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one-upsmanship (n.)

"act or practice of being 'one up,'" 1952, from noun phrase one up "scoring one more point than one's opponent" (1919) + ending from sportsmanship, etc.

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Dictionary entries near one-upsmanship

oneself

one-shot

one-sided

one-stop

one-time

one-upsmanship

one-way

ongoing

onion

oniony

online