noun
the practice of achieving an advantage over others through a display of superior skills or abilities
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The constant one-upmanship between the two rival companies led to a fierce competition for market dominance.
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There's always a bit of one-upmanship going on between my siblings when it comes to achievements.
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The group of friends engaged in a game of one-upmanship to see who could come up with the most outrageous story.
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The artist's use of bold colors and intricate details in his paintings was a form of one-upmanship against traditional styles.