偕かい老ろう同どう穴けつ

noun

happy lifelong partnership; living faithfully together till death

Only with reading かいろうどうけつ

A yojijukugo expressing the ideal of a married couple growing old together and sharing the same grave. Literary and somewhat formal.

• 二人ふたりは偕かい老ろう同どう穴けつの誓ちかいを立たてた。

  The two vowed to live together faithfully until death.

noun

Venus's flower basket (Euplectella aspergillum)

A deep-sea sponge. The name comes from the fact that a pair of small shrimp often live inside the sponge's glassy skeleton, symbolizing the idiom.

• 偕かい老ろう同どう穴けつは深しん海かいに生せい息そくする海かい綿めん動どう物ぶつの一いっ種しゅだ。

  The Venus's flower basket is a type of sponge that lives in the deep sea.