A red letter day (sometimes hyphenated as red-letter day) is any day of special significance or opportunity. Its roots are in classical antiquity; for instance, important days are indicated in red in a calendar dating from the Roman Republic (509–27 BC).
A red letter day (sometimes hyphenated as red-letter day) is any day of special significance or opportunity. Its roots are in classical antiquity; for instance, important days are indicated in red in a calendar dating from the Roman Republic (509–27 BC).
Source: Wikipedia "Red letter day" · CC BY-SA 4.0
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