blue
Preserved but no longer current.
Meaning · English
Said of talk that is smutty or indecent. Probably from the French, "Bibliothèque Bleu." When the conversation has assumed an entirely opposite character, it is then said to be BROWN or Quakerish.
Era: ca. 1874 (Victorian)
Where it’s used:
Origin
British & Irish English
Sources & notes
Historical definition reproduced from Hotten’s The Slang Dictionary (1874, public domain; Project Gutenberg #42108, retrieved 2026-07-31). Reflects the attitudes of its era.
Common questions
What does “blue” mean?
Said of talk that is smutty or indecent. Probably from the French, "Bibliothèque Bleu." When the conversation has assumed an entirely opposite character, it is then said to be BROWN or Quakerish.
Is “blue” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.