beat somebody at their own game
US /biːt ˈsʌm.bɑː.di æt ðer oʊn ɡeɪm/
UK /biːt ˈsʌm.bɑː.di æt ðer oʊn ɡeɪm/
1.
to use an opponent's own methods to defeat them
:
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The new company managed to beat their competitor at their own game by offering better customer service.
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He thought he could trick me, but I decided to beat him at his own game.