A lucky day; a day to be recalled with delight. In almanacks,
saints' days and holidays are printed in red ink, other days in black.
“That day, ... writes the doctor, was truly a red-letter day to
me.” —Wauters: Stanley's Emin Expedition, chap. vi. p. 111.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Red-letter Day from Fact Monster:
- What Colors Mean - What Colors Mean We live in a colorful world. In many countries, colors represent various holidays; ...