Definitions for one-upmanship
Random House Webster's College Dictionary
the art or practice of maneuvering for or gaining the advantage in a competitive relationship, as through status symbols or displays of superiority.
Origin of one-upmanship:
the practice of keeping one jump ahead of a friend or competitor
The art or practice of successively outdoing a competitor.
A succession of instances of outdoing a competitor.
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"one-upmanship." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/one-upmanship>.