red letter day's Usage Examples:

Red letter is an English language idiom that may refer to: A red letter day, an important occasion, festival, or anniversary A red letter edition, usually.

A red letter day (sometimes hyphenated as red-letter day or called scarlet day in academia) is any day of special significance or opportunity.

Hunter Memorial Methodist ChurchA newspaper clipping dated December 3, 1898, reads: “Last Sunday should be a red letter day in its history and one to be remembered by members of Hunter’s Memorial Methodist Episcopal Church, South.

Synonyms:

PS, address, open letter, name and address, business letter, dead letter, mail, dead mail, crank letter, invitation, form letter, missive, air letter, document, encyclical letter, aerogram, round robin, line, personal letter, epistle, aerogramme, chain letter, textual matter, cover letter, postscript, pastoral, encyclical, text, destination, correspondence, covering letter, fan letter, letter of intent, airmail letter,

Antonyms:

ordinal, uppercase, lowercase, superscript, subscript,