What does 乱す mean?
乱す is a Japanese verb meaning “to throw out of order, to disarrange, to disturb” in English. It is written as 乱す in kanji, みだす in hiragana, and midasu in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
父は私の楽観を乱さないことにした。
My father chose not to disturb my optimism.