red-let·ter day
noun/ˌred ˈletə deɪ/
/ˌred ˈletər deɪ/
- an important day, or a day that you will remember, because of something good that happened then
重要纪念日；喜庆日 - birthdays, wedding anniversaries and other red-letter days
生日、结婚纪念日和其他重要日子 - It was a red-letter day for United, who won a place in Saturday’s final.
对于曼联来说，这是一个值得纪念的日子，他们赢得了周六决赛的席位。
Word Originearly 18th cent.: from the practice of highlighting a festival in red on a calendar. - birthdays, wedding anniversaries and other red-letter days