Meaning of “red-letter day” in the English Dictionary

british dictionary

"red-letter day" in British English

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red-letter daynoun [ C usually singular ]

uk /ˌredˈlet.ə ˌdeɪ/ us /ˌredˈlet̬.ɚ ˌdeɪ/

a special, happy, and important day that you will always remember:

The day I first set foot in America was a red-letter day for me.

(Definition of “red-letter day” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)