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On some unspecified day in the future. Let me know if I can come by some day soon and help set up your computer. The CEO is coming to the office some day next month, so we can't allow anyone to take time off then.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˈsome dayat a time in the future: Some day you’ll realize what good parents you have.
Farlex Partner Idioms Dictionary © Farlex 2017