a red-letter day

red-letter day

A very important or significant day. My college graduation was a real red-letter day for my whole family.

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.