red-letter

[red-let-er]
adjective
1.
marked by red letters, as festival days in the church calendar.
2.
memorable; especially important or happy: a red-letter day in his life.

Origin:
1400–50; late Middle English

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To red-letter
Example sentences
It had been a red-letter day, of the ordinary hunting red-letter type.
When he did, it was a red-letter day for the players.
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