beat someone at his or her own game
American Heritage Dictionary of Idioms:
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beat someone at his or her own game
Surpass someone in his or her own specialty or undertaking. For example, Jean knew that if she matched the new store's discount she would keep all her customers and beat the new competitors at their own game. The use of game for any kind of undertaking or scheme dates from the mid-1200s.
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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