growing old together; sharing a long life as a couple
Literary or poetic term for a married couple growing old together. Often appears in the set phrase 偕老同穴 (かいろうどうけつ), 'living together and sharing the same grave'.
The phrase 偕老同穴 expresses a married couple growing old together and staying together until the end.
happy lifelong partnership; living faithfully together till death · Venus's flower basket (Euplectella aspergillum)
From Chinese 偕老 (xiélǎo), meaning 'to grow old together'. The kanji 偕 means 'together' and 老 means 'old age'.