red letter day
The phrase "red letter day" originates from the practice of marking important dates in red ink on calendars and has come to signify any day of particular importance or joy.
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Definition
B2General
(idiomatic)A day of special significance or celebration.
Example
- Winning the championship was a red letter day for the team.
- Her graduation day was truly a red letter day in her life.
Similar
Terms that have similar or relatively close meanings to "red letter day":
big dayday of daysthe daygood dayday of reckoningname daycalendar dayred weekfield day