Definition
Until the end of one's life; for as long as one lives.
有生之年
I will remember your kindness to me until my dying day.
我会永远记得你对我的善意。
He vowed to be faithful to his wife until his dying day.
他发誓要对妻子忠诚直到生命的最后一天。
She said she would cherish the memory until her dying day.
她说她会珍惜这段回忆直到生命的最后一天。