犬けん猿えんの仲なか

expression, noun

like cats and dogs; on very bad terms

Idiomatic expression describing a relationship of extreme mutual hostility, like that between dogs and monkeys. Often used in the pattern 〜の仲だ/である.

• あの二人ふたりは犬けん猿えんの仲なかで、顔かおを合あわせるたびに喧けん嘩かになる。

  Those two are like cats and dogs; they fight every time they see each other.

• 営えい業ぎょう部ぶと開かい発はつ部ぶは犬けん猿えんの仲なかだと言いわれている。

  The sales department and the development department are said to be on very bad terms.