| 单词 | red-letter | 
| 释义 | red-letter in American English (ˈrɛdˈlɛtər)  adjective  designating a memorable or joyous day or event: from the custom of marking holidays on the calendar in red ink red-letter in American English (ˈredˈletər) 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 Word origin[1400–50; late ME]This word is first recorded in the period 1400–50. Other words that entered Englishat around the same time include: gallery, partition, transit, trunk, union Examples of 'red-letter' in a sentence | 
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