American English

Definition of red-letter day noun from the Oxford Advanced American Dictionary


red-letter day

jump to other results
an important day, or a day that you will remember, because of something good that happened then birthdays, wedding anniversaries, and other red-letter days Winning the championship was a red-letter day for our team. From the custom of using red ink to mark holidays and festivals on a calendar.
See the Oxford Advanced Learner's Dictionary entry: red-letter day