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

1.
以牙還牙, 以毒攻毒
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.
當他們開始散佈謠言時,我們決定以牙還牙,揭露他們的謊言。
•
Some argue that to deal with cyberattacks, you sometimes have to fight fire with fire.
有人認為,要應對網路攻擊,有時你必須以牙還牙。