水すい魚ぎょの交まじわり

expression, noun

close friendship; inseparable relationship

Idiomatic expression likening a deep, inseparable bond to the relationship between water and fish. Often used in literary or formal contexts to describe a very close, mutually dependent friendship.

• 二人ふたりは水すい魚ぎょの交まじわりを結むすんだ。

  The two formed an inseparable friendship.

• 彼かれらの関かん係けいはまさに水すい魚ぎょの交まじわりだ。

  Their relationship is truly like that of water and fish.