red-letter day

listen to the pronunciation of red-letter day
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Definition of red-letter day in English English dictionary

red-letter day
Alternative form of red letter day
red-letter day
A red-letter day is a day that you will always remember because something good happens to you then. a day that you will always remember because something special happened that made you very happy
red-letter day
a memorably happy or noteworthy day
red letter day
A particularly significant day (personal or sectarian), usually very positive, sometimes very negative

In the meantime, the St. Valentine's Day Massacre at Chicago was a red-letter day in the gangster wars..

red-letter days
plural form of red-letter day
red letter day
very special day, special occasion, auspicious day, day that is worthy of notice; important day that will always be remembered; day in a diary of a woman which is marked with a secret mark to indicate the start of her menstrual period
red-letter day
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