red-letter day

noun

informal
: a very happy and important day

Dictionary Entries Near red-letter day

red-letter

red-letter day

red-light

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Cite this Entry

“Red-letter day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/red-letter%20day. Accessed 28 Nov. 2024.

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