What does 退治 mean?
退治 is a Japanese noun meaning “extermination” in English. It can also be translated as “renouncing worldly desires (in order to concentrate on Buddhist teachings), curing (an illness)” depending on context. It is written as 退治 in kanji, たいじ in hiragana, and taiji in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
彼はありを退治しようと思った。
He tried to get rid of the ants.