相あい生おい

noun

growing together; developing together

Refers to two or more things (often plants, but also abstract concepts) growing or developing in tandem. Somewhat literary or poetic.

• この庭にわの松まつと梅うめは相あい生おいの関かん係けいにある。

  The pine and plum trees in this garden have a relationship of growing together.

• 二人ふたりの友ゆう情じょうは相あい生おいのように深ふかまっていった。

  Their friendship deepened as if growing together.