fight fire with fire

US /faɪt ˈfaɪər wɪð ˈfaɪər/
UK /faɪt ˈfaɪər wɪð ˈfaɪər/
"fight fire with fire" picture
1.

火には火で, 毒を以て毒を制す

to use the same methods as your opponent, even if they are unpleasant, in order to achieve a victory

:
When they started spreading rumors, we decided to fight fire with fire and expose their lies.
彼らが噂を広め始めたとき、私たちは火には火で対抗し、彼らの嘘を暴くことにした。
Some argue that to deal with cyberattacks, you sometimes have to fight fire with fire.
サイバー攻撃に対処するには、時には火には火で対抗しなければならないと主張する人もいる。