*SET-U

English word origin

Etymology of swear

From Middle English sweren, swerien, from Old English swerian (“to swear, take an oath of office”), from Proto-West Germanic *swarjan, from Proto-Germanic *swarjaną (“to speak, swear”), from Proto-Indo-European *swer- (“

3 source sectionsExtended source reportWiktionary original ↗
In this entry · 3 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Source etymology 1

Original entry ↗
verb

To take an oath, to promise intensely, solemnly, and/or with legally binding effect. · To take an oath that an assertion is true. · To promise intensely that something is true; to strongly assert. · To administer an oath to (a person).

Selected source glosses provide context, not a complete modern definition inventory

From Middle English sweren, swerien, from Old English swerian (“to swear, take an oath of office”), from Proto-West Germanic *swarjan, from Proto-Germanic *swarjaną (“to speak, swear”), from Proto-Indo-European *swer- (“to swear”). Cognate with West Frisian swarre (“to swear”), Saterland Frisian swera (“to swear”), Dutch zweren (“to swear, vow”), Low German swören (“to swear”), sweren, German schwören (“to swear”), Danish sværge, Swedish svära (“to swear”), Icelandic sverja (“to swear”), Russian свара (svara, “quarrel”). Also cognate to Albanian var (“to hang, consider, to depend from”) through Proto-Indo-European. The original sense in all Germanic languages is “to take an oath”. The sense “to use bad language” developed in Middle English and is based on the Christian prohibition against swearing in general (cf. Matthew 5:33-37) and invoking God’s name in particular (i.e. frequent swearing was considered similar to the use of obscene words).

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Root classification mention*swer-ine-pro
  • Inherited-form mentionswerenenm
  • Inherited-form mentionswerianang · to swear, take an oath of office
  • Inherited-form mention*swarjangmw-pro
  • Inherited-form mention*swarjanągem-pro · to speak, swear
  • Derivation mention*swer-ine-pro · to swear
  • Cognate mentionswarrefy · to swear
  • Cognate mentionswerastq · to swear
  • Cognate mentionzwerennl · to swear, vow
  • Cognate mentionswörennds · to swear
  • Cognate mentionschwörende · to swear
  • Cognate mentionsværgeda
  • Cognate mentionsvärasv · to swear
  • Cognate mentionsverjais · to swear
  • Cognate mentionсвараru · quarrel
  • Cognate mentionvarsq · to hang, consider, to depend from

This page abbreviates 1 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*swer-",
        "id": "swear"
      },
      "expansion": ""
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "sweren"
      },
      "expansion": "Middle English sweren"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "swerian",
        "t": "to swear, take an oath of office"
      },
      "expansion": "Old English swerian (“to swear, take an oath of office”)"
    },
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    },
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        "2": "gem-pro",
        "3": "*swarjaną",
        "t": "to speak, swear"
      },
      "expansion": "Proto-Germanic *swarjaną (“to speak, swear”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*swer-",
        "t": "to swear"
      },
      "expansion": "Proto-Indo-European *swer- (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "fy",
        "2": "swarre",
        "t": "to swear"
      },
      "expansion": "West Frisian swarre (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "stq",
        "2": "swera",
        "t": "to swear"
      },
      "expansion": "Saterland Frisian swera (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nl",
        "2": "zweren",
        "t": "to swear, vow"
      },
      "expansion": "Dutch zweren (“to swear, vow”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nds",
        "2": "swören",
        "t": "to swear"
      },
      "expansion": "Low German swören (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "de",
        "2": "schwören",
        "t": "to swear"
      },
      "expansion": "German schwören (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "da",
        "2": "sværge"
      },
      "expansion": "Danish sværge"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "svära",
        "t": "to swear"
      },
      "expansion": "Swedish svära (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "sverja",
        "t": "to swear"
      },
      "expansion": "Icelandic sverja (“to swear”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "ru",
        "2": "свара",
        "t": "quarrel"
      },
      "expansion": "Russian свара (svara, “quarrel”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sq",
        "2": "var",
        "t": "to hang, consider, to depend from"
      },
      "expansion": "Albanian var (“to hang, consider, to depend from”)"
    }
  ],
  "links": [
    [
      "sweren",
      "sweren#Middle_English"
    ],
    [
      "swerien",
      "swerien#Middle_English"
    ],
    [
      "swerian",
      "swerian#Old_English"
    ],
    [
      "*swarjan",
      "Reconstruction:Proto-West Germanic/swarjan"
    ],
    [
      "*swarjaną",
      "Reconstruction:Proto-Germanic/swarjaną"
    ],
    [
      "*swer-",
      "Reconstruction:Proto-Indo-European/swer-"
    ],
    [
      "swarre",
      "swarre#West_Frisian"
    ],
    [
      "swera",
      "swera#Saterland_Frisian"
    ],
    [
      "zweren",
      "zweren#Dutch"
    ],
    [
      "swören",
      "swören#Low_German"
    ],
    [
      "sweren",
      "sweren#Low_German"
    ],
    [
      "schwören",
      "schwören#German"
    ],
    [
      "sværge",
      "sværge#Danish"
    ],
    [
      "svära",
      "svära#Swedish"
    ],
    [
      "sverja",
      "sverja#Icelandic"
    ],
    [
      "свара",
      "свара#Russian"
    ],
    [
      "var",
      "var#Albanian"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
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      "pos": "verb",
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        "To take an oath, to promise intensely, solemnly, and/or with legally binding effect.",
        "To take an oath that an assertion is true.",
        "To promise intensely that something is true; to strongly assert.",
        "To administer an oath to (a person)."
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  "omittedAuxiliaryFields": {
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}

Source etymology 2

Original entry ↗
noun

A swear word.

Selected source glosses provide context, not a complete modern definition inventory

From the above verb, or from Middle English sware, from Old English swaru, from Proto-Germanic *swarō.

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Inherited-form mentionswareenm
  • Inherited-form mentionswaruang
  • Inherited-form mention*swarōgem-pro
Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "sware"
      },
      "expansion": "Middle English sware"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "swaru"
      },
      "expansion": "Old English swaru"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gem-pro",
        "3": "*swarō"
      },
      "expansion": "Proto-Germanic *swarō"
    }
  ],
  "links": [
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      "sware",
      "sware#Middle_English"
    ],
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      "swaru#Old_English"
    ],
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      "Reconstruction:Proto-Germanic/swarō"
    ]
  ],
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        "A swear word."
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Source etymology 3

Original entry ↗
adj

Heavy. · Top-heavy; too high. · Dull; lazy; slow. · Reluctant; unwilling.

verb

To be lazy; rest for a short while during working hours.

noun

A lazy time; a short rest during working hours (especially field labour); a siesta.

Selected source glosses provide context, not a complete modern definition inventory

From Middle English swere, swer, swar, from Old English swǣr, swār (“heavy, heavy as a burden, of great weight, oppressive, grievous, painful, unpleasant, sad, feeling or expressing grief, grave, slow, dull, sluggish, slothful, indolent, inactive from weakness, enfeebled, weak”), from Proto-West Germanic *swār, from Proto-Germanic *swēraz (“heavy”), from Proto-Indo-European *swer- (“heavy”). Cognate with West Frisian swier (“heavy”), Dutch zwaar (“heavy, hard, difficult”), German schwer (“heavy, hard, difficult”), Danish svær (“heavy, hard, severe”), Swedish svår (“heavy, hard, severe”), Latin sērius (“earnest, grave, solemn, serious”) and Albanian varrë (“wound, plague”).

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Inherited-form mentionswereenm
  • Inherited-form mentionswǣrang
  • Inherited-form mention*swārgmw-pro
  • Inherited-form mention*swērazgem-pro · heavy
  • Derivation mention*swer-ine-pro · heavy
  • Cognate mentionswierfy · heavy
  • Cognate mentionzwaarnl · heavy, hard, difficult
  • Cognate mentionschwerde · heavy, hard, difficult
  • Cognate mentionsværda · heavy, hard, severe
  • Cognate mentionsvårsv · heavy, hard, severe
  • Cognate mentionsēriusla · earnest, grave, solemn, serious
  • Cognate mentionvarrësq · wound, plague

This page abbreviates 1 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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      "name": "inh",
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        "1": "en",
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      },
      "expansion": "Middle English swere"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "swǣr"
      },
      "expansion": "Old English swǣr"
    },
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      "args": {
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        "2": "gmw-pro",
        "3": "*swār"
      },
      "expansion": "Proto-West Germanic *swār"
    },
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        "2": "gem-pro",
        "3": "*swēraz",
        "t": "heavy"
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    },
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        "1": "en",
        "2": "ine-pro",
        "3": "*swer-",
        "t": "heavy"
      },
      "expansion": "Proto-Indo-European *swer- (“heavy”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "fy",
        "2": "swier",
        "t": "heavy"
      },
      "expansion": "West Frisian swier (“heavy”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nl",
        "2": "zwaar",
        "t": "heavy, hard, difficult"
      },
      "expansion": "Dutch zwaar (“heavy, hard, difficult”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "de",
        "2": "schwer",
        "t": "heavy, hard, difficult"
      },
      "expansion": "German schwer (“heavy, hard, difficult”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "da",
        "2": "svær",
        "t": "heavy, hard, severe"
      },
      "expansion": "Danish svær (“heavy, hard, severe”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "svår",
        "t": "heavy, hard, severe"
      },
      "expansion": "Swedish svår (“heavy, hard, severe”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "la",
        "2": "sērius",
        "t": "earnest, grave, solemn, serious"
      },
      "expansion": "Latin sērius (“earnest, grave, solemn, serious”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sq",
        "2": "varrë",
        "t": "wound, plague"
      },
      "expansion": "Albanian varrë (“wound, plague”)"
    }
  ],
  "links": [
    [
      "swere",
      "swere#Middle_English"
    ],
    [
      "swer",
      "swer#Middle_English"
    ],
    [
      "swar",
      "swar#Middle_English"
    ],
    [
      "swǣr",
      "swær#Old_English"
    ],
    [
      "swār",
      "swar#Old_English"
    ],
    [
      "*swār",
      "Reconstruction:Proto-West Germanic/swār"
    ],
    [
      "*swēraz",
      "Reconstruction:Proto-Germanic/swēraz"
    ],
    [
      "*swer-",
      "Reconstruction:Proto-Indo-European/swer-"
    ],
    [
      "swier",
      "swier#West_Frisian"
    ],
    [
      "zwaar",
      "zwaar#Dutch"
    ],
    [
      "schwer",
      "schwer#German"
    ],
    [
      "svær",
      "svær#Danish"
    ],
    [
      "svår",
      "svår#Swedish"
    ],
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      "sērius",
      "serius#Latin"
    ],
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      "varrë#Albanian"
    ]
  ],
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Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for swear →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-c3dlYXI