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English definition of “red-letter day”

red-letter day

noun [C usually singular]     /ˌredˈlet.əˌdeɪ/ US  /-ˈlet̬.ɚ-/
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.Turning points and deciding momentsCelebrations, parties and special occasionsSpecific holidays and festivals
(Definition of red-letter day noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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