verb (used with object)
to get the better of (someone); outwit.
outsmart oneself, to defeat oneself unintentionally by overly elaborate intrigue, scheming, or the like: This time he may have outsmarted himself.

1925–30; out- + smart (adj.)

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World English Dictionary
outsmart (ˌaʊtˈsmɑːt)
informal (tr) to get the better of; outwit

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"to prove too clever for," 1926, from out + smart.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We don't have outsmart each other and prove who's right and wrong.
She'll outsmart the other two to steal treats, toys and blankets.
The solution is not to fight biology, but to outsmart it.
They were too busy trying to get new products to market, win customers, and
  outsmart each other.
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