beat someone at their own game

• play someone at their own game (British)

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1. (figuratively) To successfully use someone's methods and strategies against them.

• the biter bit
• turn the tables
• hoist(ed) by one's own petard

• “beat sb at their own game”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “beat someone at their own game”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “beat play someone at their own game” (UK) in Macmillan English Dictionary.
• “beat someone at their own game” (US) in Macmillan English Dictionary.
• “to beat someone at their own game”, in Collins English Dictionary.