Origin of red-letter
Examples from the Web for red-letter
Turns out, after all, to be a red-letter day or, that is, a brown-liquid evening.
When alluding, in after years, to this visit, Browning always spoke of it as one of the red-letter days of his life.Life of Robert Browning|William Sharp
Love can always find some way to keep the red-letter days of its calendar.The Little Colonel's Holidays|Annie Fellows Johnston
Sheep-shearing day continued the red-letter day on Nantucket well into the present century.Nooks and Corners of the New England Coast|Samuel Adams Drake