yǐ​dú​gōng​dú

to cure ills with poison

以毒攻毒 yǐ​dú​gōng​dú
to cure ills with poison
to use poisonous drugs to treat diseases such as skin ulcers or toxins in traditional Chinese medicine
to fight fire with fire
to counter an evil person or harsh methods with equally ruthless means; to set a thief to catch a thief

Frequency

Movie subtitles
0.360 per million appears in 0% of films
Written text
0.367 per million

Sources