*SET-U

English word origin

Etymology of bug

First attested in this form around 1620 (referring to a “bedbug”), from earlier bugge (“beetle”), from Middle English bugge (“scarecrow, hobgoblin”) which is traced alternatively to: * a Celtic root found in Scots bogill

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In this entry · 1 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.

Unnumbered source etymology

Original entry ↗
verb

To annoy. · To act suspiciously or irrationally, especially in a way that annoys others. · To install an electronic listening device or devices in. · To bulge or protrude.

noun

An insect of the order Hemiptera (the “true bugs”). · Any motile small terrestrial invertebrate, especially one that is seen as a pest. · Any minibeast. · Any insect.

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

First attested in this form around 1620 (referring to a “bedbug”), from earlier bugge (“beetle”), from Middle English bugge (“scarecrow, hobgoblin”) which is traced alternatively to: * a Celtic root found in Scots bogill (“goblin, bugbear”) and obsolete Welsh bwg (“ghost, hobgoblin”); compare Welsh bwgwl (“threat, fear”) and Middle Irish bocanách (“supernatural being”). * Proto-Germanic *bugja- (“swollen up, thick”), from Proto-Indo-European *bʰew-, *bu- (“to swell”); compare Norwegian bugge (“big man”), dialectal Low German Bögge (“goblin, snot”). * or to a word related to buck and originally referring to a goat-shaped spectre. For the “insect” meaning the assonance with Middle English budde (“beetle”), from Old English budda, from Proto-West Germanic *buʀdō, from Proto-Germanic *buzdô, from the same ultimate source as above, might have played a role. Compare Low German Budde (“louse, grub”), Norwegian budda (“newborn domestic animal”), Icelandic budda (“purse”). More at bud. But ultimately this convergence of meaning doesn't prove a conflation of the two terms; they might have existed in parallel since PIE times with similar meanings, even if unnoticed by literary sources. The term is used to refer to technical errors and problems at least as early as the 19th century, predating the commonly known story of a moth being caught in a computer.

Relationships mentioned by the source

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

  • Derivation mentionbuggeenm
  • Cognate mentionbogillsco
  • Cognate mentionbwgcy
  • Cognate mentionbocanáchmga
  • Derivation mention*bugja-gem-pro
  • Derivation mention*bʰew-ine-pro
  • Cognate mentionbuggeno
  • Derivation mentionbuddeenm
  • Derivation mentionbuddaang
  • Derivation mention*buʀdōgmw-pro
  • Derivation mention*buzdôgem-pro
  • Cognate mentionBuddends · louse, grub
  • Cognate mentionbuddano · newborn domestic animal
  • Cognate mentionbuddais · purse

This page abbreviates 23 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": "der",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "bugge",
        "4": "",
        "5": "scarecrow, hobgoblin"
      },
      "expansion": "Middle English bugge (“scarecrow, hobgoblin”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sco",
        "2": "bogill",
        "3": "",
        "4": "goblin, bugbear"
      },
      "expansion": "Scots bogill (“goblin, bugbear”)"
    },
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    },
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      "name": "cog",
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      "expansion": "Middle Irish bocanách (“supernatural being”)"
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        "3": "*bugja-",
        "4": "",
        "5": "swollen up, thick"
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      "expansion": "Proto-Germanic *bugja- (“swollen up, thick”)"
    },
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    },
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        "4": "big man"
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      "expansion": "Norwegian bugge (“big man”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "budde",
        "4": "",
        "5": "beetle"
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      "expansion": "Middle English budde (“beetle”)"
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      "name": "der",
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    },
    {
      "name": "der",
      "args": {
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      "name": "der",
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    },
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      "name": "cog",
      "args": {
        "1": "nds",
        "2": "Budde",
        "t": "louse, grub"
      },
      "expansion": "Low German Budde (“louse, grub”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "no",
        "2": "budda",
        "t": "newborn domestic animal"
      },
      "expansion": "Norwegian budda (“newborn domestic animal”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "budda",
        "t": "purse"
      },
      "expansion": "Icelandic budda (“purse”)"
    }
  ],
  "links": [
    [
      "bedbug",
      "bedbug"
    ],
    [
      "bugge",
      "bugge#English"
    ],
    [
      "bugge",
      "bugge#Middle_English"
    ],
    [
      "bogill",
      "bogill#Scots"
    ],
    [
      "bwg",
      "bwg#Welsh"
    ],
    [
      "bwgwl",
      "bwgwl#Welsh"
    ],
    [
      "bocanách",
      "bocanách#Middle_Irish"
    ],
    [
      "*bugja-",
      "Reconstruction:Proto-Germanic/bugja-"
    ],
    [
      "*bʰew-",
      "Reconstruction:Proto-Indo-European/bʰew-"
    ],
    [
      "*bu-",
      "Reconstruction:Proto-Indo-European/bu-"
    ],
    [
      "bugge",
      "bugge#Norwegian"
    ],
    [
      "Bögge",
      "Bögge#Low_German"
    ],
    [
      "buck",
      "buck#English"
    ],
    [
      "budde",
      "budde#Middle_English"
    ],
    [
      "budda",
      "budda#Old_English"
    ],
    [
      "*buʀdō",
      "Reconstruction:Proto-West Germanic/buʀdō"
    ],
    [
      "*buzdô",
      "Reconstruction:Proto-Germanic/buzdô"
    ],
    [
      "Budde",
      "Budde#Low_German"
    ],
    [
      "budda",
      "budda#Norwegian"
    ],
    [
      "budda",
      "budda#Icelandic"
    ],
    [
      "bud",
      "bud#English"
    ]
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  "references": [],
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      "pos": "verb",
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        "To annoy.",
        "To act suspiciously or irrationally, especially in a way that annoys others.",
        "To install an electronic listening device or devices in.",
        "To bulge or protrude."
      ],
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      "pos": "noun",
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        "An insect of the order Hemiptera (the “true bugs”).",
        "Any motile small terrestrial invertebrate, especially one that is seen as a pest.",
        "Any minibeast.",
        "Any insect."
      ],
      "tags": [
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  "omittedAuxiliaryFields": {
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    "glosses": 0
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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 bug →

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-YnVn