1. In the past, special days would be marked with red letters making it a red letter day
2. Any day with personal significance
3. A day that you make someone else's day wonderful through various ways
1. Oh look, it's the queens birthday tomorrow. Better get ready for the red letter day!
2. Oh look, my girlfriends birthday is coming up. Better get ready for the red letter day!
3. I went with my girlfriend shopping and bought her everything she wanted, then we had a candlelit dinner and finally, I sang her to sleep under the stars. All of this because it was her red letter day
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