Etymologically

Etymology and origin of the French word fausser

Confidence
Established
Formation
Inherited
First attested
c. 1100 Chanson de Roland More words from the 11th century
Inherited from
Latin falso via Old French
Ultimate origin
Latin falsus
Etymology tree
inherited borrowed derived
Latin fallō
Italian fallare
Italian fallire
Italian fallo
Latin falsus
Catalan fals
French faux
English faux
Italian falso
Romanian fals
Spanish falso
English false
Latin falsō
French fausser
Italian falsare
From the same root
Latin fallāx ← fallō
Latin refellō ← fallō
Latin falsificō ← falsus
Latin falsum ← falsus
English falsehood ← false

Pronunciation

Forms

fausser[1] Old French falser; the form fausser appears in the 12th century.[2][3][4] Anglo-Norman also has faucer, faulser and fauxer.[5]

Etymology

It is inherited from Old French falser, inherited from Late Latin falsō (“to falsify, alter”), from falsus (“false”).[6][7][4][1][8]

Cognate with Italian falsare, Occitan falsar, Spanish falsear and Portuguese falsar.[9][10]

Earliest recorded meaning

It first appears as falser in the Chanson de Roland (about 1100), in the feudal sense “to declare a statement false, give the lie to”.[6][4]

Semantic evolution

Medieval French also used it for “to falsify” and “to accuse of falsehood”.[7][4] Of armour it meant “to damage, break through”: Wace writes that the hauberk falsa in 1155.[6][10] From that sense of damage comes fausset (1322), the peg that stops the hole bored in a cask.[7][4]

The sense “to break one's word” appears in the 12th century,[6][4] with fausser sa foi at the end of the 15th century and fausser compagnie before 1565;[2][4][9] fausser compagnie first meant being unfaithful to a company, then leaving without taking leave.[2][4][9] The abstract sense “to distort the truth” goes back to 1273, and jugement faussé is found in 1580.[4]

Timeline

  • c. 1100 – Falser “to give the lie to” appears in the Chanson de Roland.[6]
  • c. 1135 – Falser a “to break faith with someone” is recorded.[6]
  • 1155 – Wace uses it of a damaged hauberk.[6]
  • 1273 – It is used for “to distort the truth”.[4][2]
  • 1322 – The derivative fausset “cask peg” appears.[7][4]
  • 1580 – Montaigne uses it of the judgement.[4][2]
  • Before 1565 – Fausser compagnie is first recorded.[6][4]
  • 1792 – The derivative se défausser appears.[4]

Meanings

Verb

  1. To distort or falsify something abstract; to make (a result, a calculation) inaccurate.[11][1] Une seule erreur a faussé toute l'enquête.[11][1]
  2. To warp or impair the soundness of (the mind, the judgement).[11] Ces préjugés lui ont faussé le jugement.[11]
  3. To bend or damage (a mechanism, a key, a lock) by excessive force.[11]
  4. Fausser compagnie (à quelqu'un): to leave someone abruptly or without warning.[11][9]
  5. (Canada, familiar, intransitive) To sing out of tune.[11]

Word family

  • fausset
  • défausser

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  3. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  4. ^ a b c d e f g h i j k l m n Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  5. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
  6. ^ a b c d e f g h Trésor de la langue française informatisé (2004), ATILF – CNRS & Université de Lorraine, atilf.fr/tlfi; electronic version of Imbs, Paul; Quemada, Bernard, eds. (1971–1994), Trésor de la langue française, Paris: CNRS / Gallimard
  7. ^ a b c d Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  8. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 3, 393a
  9. ^ a b c d Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  10. ^ a b Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
  11. ^ a b c d e f g Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert

Related etymologies

Cite this entry

“Fausser.” Etymologically, 14 Nov. 2026, etymologically.com/fr/fausser. Accessed 15 Nov. 2026.

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