red-let·ter /ˈrɛdˌlɛtɚ/
(a.)紅字的,用紅字表示的
Red-let·ter a. Of or pertaining to a red letter; marked by red letters.
Red-letter day, a day that is fortunate or auspicious; -- so called in allusion to the custom of marking holy days, or saints' days, in the old calendars with red letters.
◄ ►