from the practice of marking holy days in red letters in church calendars
1704, in the meaning defined above
11 Words from the Bible You Didn't Know...
'Nimrod', 'scapegoat', and other good words from the Good Book
red-legged snipe
red-letter
red-letter day
“Red-letter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/red-letter. Accessed 23 Sep. 2023.
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