Definitions for one-up
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Random House Webster's College Dictionary
one′ up′(adj.)
having gained an advantage, esp. over a rival.
Origin of one up:
1920
one′-up′(v.t.)-upped, -up•ping.
to gain an advantage over; be a move, step, etc., ahead of:
to one-up the competition.
Category: Common Vocabulary
Origin of one-up:
1960–65
Wiktionary
one-up(Noun)
An additional life or an object that increases the player's number of chances or "lives" by one.
If you hit that block, you can get a one-up.
one-up(Verb)
To outdo, to do something slightly better than a competitor's prior effort.
Every year the neighbors try to one-up each other with their holiday lights.
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"one-up." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/one-up>.