noun
EXAMPLES FROM CORPUS
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August 17 was a red-letter day because at last the dorado-catching campaign succeeded.
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Finally the couple may be celebrating a birthday, a wedding anniversary or some other red-letter day .
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It could mean the difference between a red-letter day and an empty basket.
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It is also a red-letter day for Bath's Ben Clarke, who makes his debut.
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This was a red-letter day indeed.