Red–letter Day Definition & Meaning | Britannica Dictionary

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The Britannica Dictionary red–letter day 1 ENTRIES FOUND:

• red–letter day (noun)

red–letter day noun plural red–letter days red–letter day noun plural red–letter days Britannica Dictionary definition of RED–LETTER DAY [count] informal : a very happy and important day

• Yesterday was a red-letter day for the graduating class.

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