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.
ganarle a alguien en su propio juego, pagar con la misma moneda
to use an opponent's own methods to defeat them
:
•
The new company managed to beat their competitor at their own game by offering better customer service.
La nueva empresa logró ganarle a su competidor en su propio juego ofreciendo un mejor servicio al cliente.
•
He thought he could trick me, but I decided to beat him at his own game.
Pensó que podía engañarme, pero decidí ganarle en su propio juego.