one of these days

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one of these days (not comparable)

1. One day, some day (especially in warning of a negative consequence).

   One of these days, he won't be so lucky.

   We'll be seeing you one of these days, I expect.

• someday; see also Thesaurus:one day

• one of those days

• “one of these days”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “one of these days”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “one of these days” (US) / “one of these days” (UK) in Macmillan English Dictionary.
• “one of these days”, in Collins English Dictionary.