red-letter day

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red-letter day

A very important or significant day. My college graduation was a real red-letter day for my whole family.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

red-letter day

Fig. an important or significant day. (From the practice of printing holidays in red on the calendar.) Today was a red-letter day in our history. It was a red-letter day for our club.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

red-letter day

A special occasion, as in When Jack comes home from his tour of duty, that'll be a red-letter day. This term alludes to the practice of marking feast days and other holy days in red on church calendars, dating from the 1400s. [c. 1700]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

a red-letter day

A red-letter day is a day when something very important or exciting happens. Back in 1986 Jim had his first picture published in BBC Wildlife Magazine. `That was a real red-letter day for me!' he confesses. Note: In the past, important feast days and saints' days were printed in red in some calendars.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

a red letter day

a pleasantly memorable, fortunate, or happy day.
In Church calendars, a saint's day or church festival was traditionally distinguished by being written in red letters.
See also: letter, red
Farlex Partner Idioms Dictionary © Farlex 2017

a red-ˈletter day

a very special day which is remembered because something important or good happened: Today was a red-letter day. We heard we had won a free trip to Japan.Religious holidays and other important dates used to be printed in red on calendars.
Farlex Partner Idioms Dictionary © Farlex 2017

red-letter day

n. an important day that might well be marked in red on the calendar. Today was a red-letter day in our history.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

red-letter day, a

A special occasion. The term comes from the practice of printing feast days and other special holy days in red on ecclesiastical calendars, from the fifteenth century on. Charles Lamb used the expression in describing Oxford during the long vacation: “The red-letter days now become, to all intents and purposes, dead-letter days” (Essays of Elia, 1823).
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
One of the remarkable features of the process that has seen the first red-letter day lead to the second, is the lack of an internal spat within the Labour party over its contents.
If they finally come round to the idea of a strong Assembly, that will be a real red-letter day for Wales.