Webster's Online Dictionary
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Specialty Expressions: BLACK LETTER DAY

ExpressionsDomainDefinition
Black Letter DayLiterature1: Matthias: Pursuits of Literature.
2: An unlucky day; one to be recalled with regret. The Romans marked their unlucky days with a piece of black charcoal, and their lucky ones with white chalk.
3: That from Gothic kennels eager strut."
4: "By fell black-letter dogs...
5: Black-letter dogs. Literary antiquaries who poke and pry into every hole and corner to find out black-letter copies of books. Source: Brewer's Dictionary.

Source: compiled by the editor from various references; see credits.

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