Definition of until one's dying day
- I will remember his words until my dying day.
used as a function word to indicate continuance (as of an action or condition) to a specified time
: up to the time that : up to such time as
: approaching death : gradually ceasing to be
: having reached an advanced or ultimate stage of decay or disuse
: of, relating to, or occurring at the time of death or dying
: the time of light between one night and the next
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