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Etymology and origin of the English word sap

Ayto counts three words spelled sap: the plant juice, the verb "to undermine", and the slang word for a fool, which he takes from the first.[1]

Pronunciation

sap1 plant juice

Confidence
Established
Formation
Inherited
First attested
c. 750
Inherited from
Proto-Germanic *sap via Middle English, Old English
Ultimate origin
Proto-West Germanic *sap

Etymology

The plant juice is inherited from Middle English sap, also zep,[3] inherited from Old English sæp,[4][5][6][7] inherited from Proto-West Germanic *sap (“sap, juice”),[2] which Etymonline and Barnhart give as Proto-Germanic *sapam.[5][3] It is related to Middle Low German sap, Middle Dutch sap, Dutch sap and Old High German saf, whose descendant German Saft (“juice”) has an added -t,[4][5][8] and to Old Norse safi (“sap”).[4][8][9] Etymonline and Klein trace it to Proto-Indo-European *sab- (“juice, fluid; to taste”),[5][10] the source also of Sanskrit सबर् (sabar, “sap, milk, nectar”);[5][10][2] the OED and Klein think it may be cognate with Latin sapa (“must boiled thick”) and sapiō (“to taste”),[4][10] and Latin sapa, influenced by the Germanic word, became French sève (“sap”).[4][11] The OED rejects the idea that the Germanic word was borrowed from Latin sapa.[4]

Earliest recorded meaning

The vital juice that circulates in plants: in Old English, where Barnhart dates the word to about 750 and the OED's first quotation is from the poem Christ III.[3][4] In Middle English it appears as zep in the Ayenbite of Inwyt (1340) and as sap from 1377.[3]

Semantic evolution

The word was soon used for the sapwood of a tree (Chaucer's translation of Boethius, about 1374)[4] and, from 1526, figuratively for vigour or vitality.[4][8] For a time it could also mean any juice (1527–1623) and even ear-wax (about 1440).[4] The verb, to drain of sap, is recorded from 1725.[4][5][6] The slang sap, a fool, is recorded from 1793 in Etymonline and Green's;[5][12] the OED's first quotation is from Scott's Guy Mannering (1815).[4] The OED takes it as short for sapskull,[4] and Ayto and the Oxford Dictionary of English explain that compound as a head of soft sapwood;[1][13] Barnhart adds that it may partly come from sappy,[3] while Etymonline and Green's see the image of someone "green", full of sap, and Etymonline also mentions a dialect sense "mush, sop".[5][12] The American slang sap, a club or blackjack (1899, in Josiah Flynt's Tramping with Tramps), is taken as short for sapling, from which such clubs were first cut;[4][14][12][13][5] the verb, to hit with a sap, follows in 1926.[4][5] The American Heritage Dictionary puts the verb sense "to weaken, exhaust" under this word, as partly from sap2 understood as draining the sap;[14] most other dictionaries derive that sense from the verb meaning to undermine.[3][13][4]

Timeline

  • c. 750 – Old English sæp.[3]
  • c. 1374 – sapwood.[4]
  • c. 1440 – ear-wax (obsolete).[4]
  • 1526 – vigour, vitality.[4]
  • 1527 – any juice or fluid (obsolete by 1623).[4]
  • 1725 – verb, to drain of sap.[4][6]
  • 1793 – a fool, a simpleton.[5][12]
  • 1899 – a club or blackjack.[4][5]
  • 1926 – verb, to hit with a sap.[4][5]

Meanings

Noun

  1. The watery fluid that circulates through a plant, carrying nutrients and the products of photosynthesis.[15][6][4]
  2. Vigour or vitality: the sap of youth.[15][8]
  3. Sapwood.[15][4]
  4. (slang) A gullible or foolish person: Only a sap would believe that story.[15][4]
  5. (US slang) A short club or blackjack.[4][14]

Verb

  1. To drain of sap; to remove the sapwood from a log.[6][4]
  2. (slang) To hit or knock out with a sap.[6][4]

Word family

  • sapless
  • saplessness
  • saphead
  • sapheaded
  • sapling
  • sappy
  • sapsucker
  • pinesap
  • sapwood

sap2 undermine; trench

Confidence
Established
Formation
Borrowing
First attested
1591
Borrowed from
Middle French saper
Ultimate origin
Late Latin sappa

Etymology

The verb meaning to undermine is borrowed from Middle French saper, earlier sapper,[4][3][6] from sappe (“spade”),[3][5] and the noun comes partly from that French noun, partly Italian zappa (“spade, mattock, hoe”);[4][3][8] the Italian verb is zappare (“to dig with a hoe”).[14][3] Both go back to Late Latin sappa (“spade, mattock”), recorded in the 6th century,[4][11][3] also the source of Spanish zapa (“spade”).[5][4] Its further origin is unknown.[5][14][11] The Shorter Oxford and the Oxford Dictionary of English suggest an Arabic source meaning "underground passage" or "to probe a wound",[8][13] and Merriam-Webster and Dictionary.com compare the dialect word Old Italian zappo (“goat”).[6][16]

Earliest recorded meaning

The process of undermining a wall or fortification: 1591, in the correspondence of Sir Henry Unton.[4][6][3] The verb, to dig a covered trench towards an enemy position, is first recorded in Florio's Italian–English dictionary A Worlde of Wordes (1598).[4][3]

Semantic evolution

In siege warfare a sap was a covered trench by which attackers approached a fortress under fire (1642).[4][3][5] From 1652 the verb was used of digging under the foundations of a wall, and of natural forces that undermine something;[4][3][5] Addison used it of a metaphorical foundation in 1711.[4][3] The sense "to weaken or destroy gradually", used of health, strength or courage, follows in 1755.[4][3] It is often taken as a figurative "draining of sap", but the Oxford dictionaries derive it from this verb;[13][17] Barnhart, Etymonline and Ayto think it was influenced by sap1,[3][5][1] and the American Heritage Dictionary takes it as partly from that word.[14] A soldier who dug saps was a sapper (1626).[3] In English school slang to sap was to study hard (1830) and a sap a hard-working pupil (1798);[4][12] the OED takes this as a figurative use of the digging verb,[4] while Green's derives it from Latin sapiēns (“wise”).[12]

Timeline

  • 1566 – sap, a kind of spade (obsolete by 1598).[4]
  • 1591 – the process of undermining a fortification.[4][6]
  • 1598 – verb, to dig a sap.[4][3]
  • 1642 – a covered trench for approaching a besieged place.[4][3]
  • 1652 – verb, to undermine the foundations of a wall.[4][3]
  • 1711 – figuratively, to undermine.[4][3]
  • 1748 – noun, a stealthy method of attack or destruction.[4]
  • 1755 – verb, to weaken or exhaust gradually.[4][3]

Meanings

Verb

  1. To weaken or exhaust gradually: The long climb sapped her strength.[6][4]
  2. To undermine a wall or other structure by digging under it, or by wearing away its foundations.[6][4]
  3. To dig a sap, or to approach a fortified place by saps.[6][4]

Noun

  1. A covered trench dug towards a besieged place, by which attackers can approach under fire.[6][4][8]
  2. The act of undermining something, especially by stealthy or gradual means.[6][4]

Word family

  • sapper
  • unsapped

References

  1. ^ a b c Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
  2. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
  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 Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  4. ^ 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 42 43 44 45 46 47 48 49 50 51 52 53 54 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  5. ^ a b c d e f g h i j k l m n o p q r s Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f g h i j k l m n o Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ Bosworth, Joseph; Toller, T. Northcote (1898), An Anglo-Saxon Dictionary, Oxford: Clarendon Press; Toller, T. Northcote (1921), Supplement
  8. ^ a b c d e f g Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  9. ^ Orel, Vladimir (2003), A Handbook of Germanic Etymology, Leiden / Boston: Brill
  10. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  11. ^ a b c Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  12. ^ a b c d e f Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
  13. ^ a b c d e Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  14. ^ a b c d e f The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  15. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins
  16. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  17. ^ Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press

Related etymologies

  • stall · also from Proto-Germanic
  • warmth · also from Proto-Germanic
  • foam · also from Proto-Germanic
  • mold · also from Proto-Germanic
  • worm · also from Proto-Germanic
  • dwarf · also from Proto-Germanic
  • deed · also from Proto-Germanic
  • crab · also from Proto-Germanic
Cite this entry

“Sap.” Etymologically, 26 Oct. 2026, etymologically.com/en/sap. Accessed 26 Oct. 2026.

Last edited on . ·