065. All The Colours of The Rainbow

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.

The idiom "black sheep" originated in the early 18th century. It refers to the world of sheep farming, where black sheep were considered less desirable because their dark wool could not be easily dyed or blended with white wool. This association led to the metaphorical use of "black sheep" to describe a person who stands out or deviates from the expected norms within a family or group. The idiom is typically used in a negative way to describe someone who is different from the others in a family or group.