until (one's) dying day

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until (one's) dying day

For the entirety or remainder of one's life. until my dying day, I will never forgive him for what he's done to our family. Despite all her doctors' warnings, my grandmother smoked cigarettes like a chimney until her dying day.
See also: dying, until

till/to/until your ˌdying ˈday

for as long as you live: I swear I won’t forgive her to my dying day!
See also: dying, till, until