Etymologically

bleu

Etymology and origin of the French word bleu

Confidence
Established
Formation
Borrowing
First attested
c. 1100, Chanson de Roland (bloi)
Borrowed from
Frankish *blāo via Old French
Ultimate origin
Proto-Germanic (*blēwaz)

Pronunciation

Forms

bleu (feminine bleue, masculine plural bleus, feminine plural bleues)[1] Old French blo, bloi, bloe (about 1175), blou (about 1200) and blef (about 1221); the form bleu, bleue dates from the 13th century.[2][3][4]

Etymology

It is inherited from Old French blo, borrowed from Frankish *blāo (“blue”), a Germanic word that took root only in Gallo-Romance (compare Old Occitan blau).[4][5][2][6] Rey and Wiktionary place between them Late Latin blāvus, found in Isidore of Seville.[2][1] The Frankish word is reconstructed from Old High German blāo (modern German blau) and goes back to Proto-Germanic *blēwaz, the source also of Dutch blauw, Old Norse blár (“dark blue, livid”) and Old English blāw.[2][1] Rey thinks it probably related to Latin flāvus (“golden yellow”).[2]

The old forms differ by source: “blef” is a masculine remade after the old feminine “bleve”, “blo” and “bloe” continue the primitive “blao”, and “bleu” comes from a type “*bláwu”.[2] English blue was borrowed from French.[2]

Earliest recorded meaning

Its first sense seems to have been either “pale, whitish” or “livid, bluish”, of the complexion and of bruised skin.[2][5] The Chanson de Roland has Sur un perron de marbre bloi se couche (“he lies down on a block of bloi marble”) and gonfanons blancs et blois et vermeilz (“white, bloi and red pennants”).[3]

Semantic evolution

The dominant sense, the colour of the clear sky, appears about 1150.[2][5] The older physical sense survives in être bleu de peur and in the maladie bleue (1837) of medicine; from the 17th century devenir tout bleu, later en rester bleu, meant to be dumbfounded.[2][7] As a noun it has meant the colour since 1180–1200, a blue dye since 1577 and a bruise since 1863.[2] Passer au bleu “to make disappear” (1877) comes from the laundry blue used to whiten linen.[2]

In several phrases its sense is far from the sky: vin bleu is poor red wine (about 1850), un bifteck bleu is very rare (about 1950), and sang bleu is usually seen as a calque of Spanish sangre azul, the blood of Castilian families who claimed to have no Moorish or Jewish ancestry.[2] Recent phrases include zone bleue (1957) and carte bleue.[2] In Belgian French être bleu de quelqu'un is to be madly in love with them.[2]

Timeline

  • c. 1100 – Bloi in the Chanson de Roland.[3]
  • c. 1150 – The colour of the clear sky.[2][5]
  • 1180–1200 – Le bleu, the colour.[2]
  • 13th century – The form bleu.[2]
  • 1577 – A blue dye.[2]
  • 1690 – Furetière records devenir tout bleu “to be overcome”.[7]
  • 1837 – Maladie bleue.[2]
  • 1863 – Un bleu, a bruise.[2]
  • c. 1950 – Bifteck bleu.[2]

Meanings

Adjective

  1. blue: des yeux bleus, le ciel bleu.[8][9]
  2. (of meat) Very rare, barely cooked: un steak bleu.[1][10]
  3. Livid, bluish: bleu de froid, bleu de peur.[2]
  4. (familiar) En rester bleu: to be dumbfounded.[7][2]
  5. (Belgium) Être bleu de: to be madly in love with.[2]
  6. In set phrases: sang bleu (noble blood), fleur bleue (sentimental), conte bleu (fairy tale).[8][10]

Noun

  1. The colour blue.[1][8]
  2. A bruise.[1][2]
  3. (familiar) A raw recruit, a novice.[1]
  4. blue cheese.[1]
  5. Laundry blue, a blue dye.[2]

Word family

  • bleuâtre
  • bleuet
  • bleuir
  • English blue
  • German blau

Usage notes

A separate interjection bleu is a euphemistic alteration of Dieu used in oaths.[1]

References

  1. ^ a b c d e f g h i j Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  3. ^ a b c Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  4. ^ a b Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  5. ^ a b c d Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  6. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 15/1, 146b
  7. ^ a b c Quemada, Bernard, ed. (1959–2006), Datations et documents lexicographiques (Base historique du vocabulaire français, BHVF), Paris: Klincksieck / CNRS / Champion; ATILF
  8. ^ a b c Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  9. ^ Dictionnaire Le Robert en ligne, dictionnaire.lerobert.com (accessed 2024)
  10. ^ a b Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse

Related etymologies

Cite this entry

“Bleu.” Etymologically, 18 Oct. 2026, etymologically.com/fr/bleu. Accessed 18 Oct. 2026.

Last edited on . ·