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.
battre quelqu'un à son propre jeu, rendre la pareille
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 nouvelle entreprise a réussi à battre son concurrent à son propre jeu en offrant un meilleur service client.
•
He thought he could trick me, but I decided to beat him at his own game.
Il pensait pouvoir me tromper, mais j’ai décidé de le battre à son propre jeu.