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Etymology and origin of the English word foil

Pronunciation

foil1 thwart

Confidence
Probable
Formation
Borrowing
First attested
c1330, Arthour and Merlin
Borrowed from
Old French fouler via Middle English
Ultimate origin
Latin fullō

Etymology

The verb is inherited from Middle English foilen (“to trample”), borrowed from Old French fouler (“to full cloth, trample, oppress”),[2][3][4] of which the English form is an irregular representation,[5][3][6] perhaps through an Anglo-Norman variant;[7][8] The Anglo-Norman Dictionary records the verb in Anglo-Norman from 1121–25, meaning to full cloth, to trample and to oppress.[9] The French verb comes from Vulgar Latin *fullō (“to clean cloth”) (by treading on it),[3][10] formed on fullō (“fuller”), a word of unknown origin.[3][6][8] The OED notes that the English spelling “foyle” would normally represent fouillier (“to dig, root”), and that the cause of this irregularity has not been found.[5] Weekley thought the verb was a blend of fouler with affoler (“to befool”).[11] Full, to thicken cloth, and fuller are from the same source.[3][4]

Earliest recorded meaning

To trample under foot: about 1330, in Arthour and Merlin,[5] and before 1300 in Barnhart;[12] Etymonline gives about 1300, in the hunting sense of spoiling a trace or scent by running over it.[3]

Semantic evolution

From trampling, the verb passed to the hunting sense, of a hunted animal running over its own track and so baffling the hounds (about 1410 in Barnhart, 1649 in the OED),[12][5] which gave the noun foil, the track of a hunted animal (1575), as in run the foil.[5][7] The sense "to overthrow, defeat an enemy" is recorded from 1548 and "to frustrate an attempt or baffle a person" from before 1564,[5][3] and a noun meaning a repulse or setback followed in the late 15th century.[5][3] In wrestling a foil was a throw that did not result in a flat fall (1553–1721).[5] Influenced by foul and defile, the verb also meant to defile or dishonour in late Middle English.[5][7] The cry Foiled again! is recorded from 1847.[3] In Cumberland and Yorkshire, to run the old foil meant of a hare to run the same course twice, and figuratively to court a former sweetheart again.[13]

Timeline

  • c. 1300 – to spoil a scent by running over it.[3]
  • c. 1330 – to trample down.[5]
  • c. 1380 – to defile (now dialect).[5]
  • c. 1478 – noun: a repulse, defeat.[5]
  • 1548 – to defeat an opponent.[5][3]
  • a1564 – to frustrate, baffle.[5]
  • 1575 – noun: the track of a hunted animal.[5]
  • 1847 – Foiled again![3]

Modern meaning

Verb

  1. To prevent someone from achieving an aim; to thwart or frustrate a plan: Police foiled the robbery.
  2. (hunting) Of an animal: to cross or retrace its track so as to spoil the scent.
  3. (obsolete) To trample.

Noun

  1. (archaic) A setback or defeat.
  2. (hunting) The track or scent of a hunted animal.

Word family

  • foilable
  • unfoiled

foil2 thin sheet of metal

Confidence
Established
Formation
Borrowing
First attested
c1325, foyle
Borrowed from
Old French foil via Middle English
Ultimate origin
Latin folium

Etymology

The metal leaf is inherited from Middle English foile,[2][3] borrowed from Old French foil (“leaf; sheet of metal”) (masculine) and foille (feminine), modern French feuille.[5][7][3][6] The masculine comes from folium (“leaf”), and the feminine from its plural folia, taken as a feminine singular;[5][6][3][11] the feminine has replaced the masculine in all the modern Romance languages except in Italian foglio, a leaf of a book.[5][11] The Latin word is cognate with Ancient Greek φύλλον (phúllon, “leaf”),[5][11] and Etymonline and the AHD take it from the Indo-European root Proto-Indo-European *bʰel- (“to thrive, bloom”),[3][14] which, according to Ayto, also gave blade, bloom, blossom and flower.[8] It is the second element of trefoil, cinquefoil and milfoil.[7][4]

Earliest recorded meaning

A very thin sheet of metal: about 1325, spelled foyle, in Barnhart,[12] early 14th century in Etymonline,[3] and 1398, in John Trevisa's translation of Bartholomaeus Anglicus, in the OED.[5] The sense "leaf of a plant" is recorded from about 1420, but it had died out by about 1500.[5][8]

Semantic evolution

In the 16th century jewellers placed a thin leaf of metal under a precious stone to make it shine more brightly,[6][3] which led to the figurative sense, a person or thing that sets off another by contrast (1580s).[3][8][11] A sheet of metal behind the glass of a mirror was a foil from before 1582.[5] In architecture the word names, from 1835, one of the small arcs between the cusps of Gothic tracery,[5][4] and in heraldry the representation of a leaf from 1562.[5] Metal foil as a wrapping for food is recorded from 1897 in Etymonline[3] and 1946 in the OED.[5] Since the mid-20th century foil has also been a short form of hydrofoil.[7] The verb, to back or cover with foil, dates from 1611,[2][5][3] and "to set off by contrast" from 1856, in Ruskin.[5]

Timeline

  • c. 1325 – foyle, thin sheet of metal.[12]
  • c. 1420 – a leaf of a plant (obsolete).[5]
  • 1562 – (heraldry) the representation of a leaf.[5]
  • 1580s – one who sets off another by contrast.[3]
  • 1611 – verb: to back with foil.[5][2]
  • 1835 – (architecture) a small arc in tracery.[5]
  • 1897 – metal foil for wrapping food.[3]

Modern meaning

Noun

  1. Metal beaten or rolled into a very thin, flexible sheet: Wrap the fish in foil before baking.
  2. A person or thing that sets off another by contrast: The calm sister was a perfect foil to her restless brother.
  3. A thin leaf of metal placed behind a gem or the glass of a mirror.
  4. (architecture) A small arc or lobe between the cusps in tracery.
  5. A hydrofoil.

Verb

  1. To back or cover with foil.
  2. To set off by contrast.

Word family

  • tinfoil
  • trefoil
  • quatrefoil
  • cinquefoil
  • hydrofoil
  • airfoil

foil3 fencing sword

Confidence
Uncertain
First attested
1594, Thomas Nashe

Etymology

The sword is of uncertain origin.[5][6][7][8] It is usually taken from the verb foil in the sense of a weapon with its point blunted or made harmless,[12][4][5] but the OED objects that the verb does not seem to have meant "to blunt".[5] The OED also mentions that the phrase “at foils” may first have belonged to the noun meaning a parry, or that the word may be an alteration of foin, a thrust, which named a fencing sword in the 17th century.[5] Etymonline and Ayto allow a transferred use of foil meaning a leaf,[3][8] and Weekley thought it the same word, since French feuille is still used for the blade of a saw,[11] but the OED finds no evidence for this.[5]

Earliest recorded meaning

A light fencing sword with a blunt edge and a button on the point: 1594, in Thomas Nashe's The Unfortunate Traveller.[5][12][3]

Semantic evolution

The plural foils named the sport of fencing with these weapons from 1600, especially in the phrase “at foils”,[5][7] and a verb, to thrust with a foil, is recorded in the same year.[5] In modern fencing the foil is one of three weapons, with a flexible blade of rectangular section, and hits count only on the trunk.[15][2]

Timeline

  • 1594 – a light fencing sword.[5][12]
  • 1600 – foils, fencing; the verb, to thrust with a foil.[5]

Modern meaning

Noun

  1. A light, flexible fencing sword with a button on its point to prevent injury.
  2. (in plural) The sport of fencing with such swords.

Word family

  • foilist
  • foilsman

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  3. ^ 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 Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  5. ^ 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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  6. ^ a b c d e f Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  7. ^ a b c d e f g h Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  8. ^ a b c d e f g Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
  9. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
  10. ^ Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
  11. ^ a b c d e f Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  12. ^ a b c d e f g Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  13. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
  14. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  15. ^ Collins English Dictionary (2023), Glasgow: HarperCollins

Related etymologies

Cite this entry

“Foil.” Etymologically, 22 Oct. 2026, etymologically.com/en/foil. Accessed 23 Oct. 2026.

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