red-letter day
red
rɛd
red
le
le
tter
day
deɪ
dei

Definition & Meaning of "red-letter day"in English

Red-letter day
01

a day that will always be remembered by an exceptionally good thing that has happened on it 

red-letter day definition and meaning
Idiom
Grammatical Information
Animacy status
Abstract
Composition
Compound
Countable
Plural form
red-letter days

What is the origin of the idiom "red-letter day" and when to use it?

The origin of the idiom "red-letter day" can be traced back to medieval manuscripts. In religious texts, particularly in the Christian tradition, important feast days and holy days were traditionally written in red ink or highlighted with red letters to signify their significance. The practice of using red ink for these special days can be traced back to as early as the 8th century. It is commonly used to describe personal milestones such as birthdays, weddings, graduations, or anniversaries, which hold special importance and are celebrated with joy and enthusiasm.

Examples
Before making a decision, you need to know how the land lies. 
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