fight fire with fire
US /faɪt ˈfaɪər wɪð ˈfaɪər/
UK /faɪt ˈfaɪər wɪð ˈfaɪər/

1.
combater fogo com fogo, pagar na mesma moeda
to use the same methods as your opponent, even if they are unpleasant, in order to achieve a victory
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When they started spreading rumors, we decided to fight fire with fire and expose their lies.
Quando eles começaram a espalhar rumores, decidimos combater fogo com fogo e expor suas mentiras.
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Some argue that to deal with cyberattacks, you sometimes have to fight fire with fire.
Alguns argumentam que, para lidar com ataques cibernéticos, às vezes é preciso combater fogo com fogo.