until one's dying day

• till one's dying day
• to one's dying day

until one's dying day

1. As long as one lives.

• with one's dying breath

• “to until my dying day”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “until one's dying day”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “to until someone s dying day” (US) / “to until someone s dying day” (UK) in Macmillan English Dictionary.
• “till your dying day” in Idioms and phrases, TheFreeDictionary.com, Huntingdon Valley, Pa.: Farlex, Inc., 2003–2025.