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(set phrase) At some unspecified time in the future. examples
At some unspecified time in the past. quotations examples
One day I was out in the barn and he drifted in. I was currying the horse and he set down on the wheelbarrow and begun to ask questions.
1913, Joseph C. Lincoln, chapter 11, in Mr. Pratt's Patients
Used other than figuratively or idiomatically: see one, day. examples