*SET-U

English word origin

Etymology of quack

From Middle English *quacken, queken (“to croak like a frog; make a noise like a duck, goose, or quail”), from quack, qwacke, quek, queke (“quack”, interjection and noun), also kek, keke, whec-, partly of imitative origi

2 source sectionsExtended source reportWiktionary original ↗
In this entry · 2 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

Of a duck, to make its characteristic vocalisation. · To make a sound similar to the quack of a duck. · Of a queen bee: to make a high-pitched sound during certain stages of development.

noun

The vocalisation made by a duck.

intj

A duck's quack.

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

From Middle English *quacken, queken (“to croak like a frog; make a noise like a duck, goose, or quail”), from quack, qwacke, quek, queke (“quack”, interjection and noun), also kek, keke, whec-, partly of imitative origin and partly from Middle Dutch quacken (“to croak, quack”), from Old Dutch *kwaken (“to croak, quack”), from Proto-West Germanic *kwakōn, from Proto-Germanic *kwakaną, *kwakōną (“to croak”), of imitative origin. Cognate with Saterland Frisian kwoakje, kwaakje (“to quack”), Middle Low German quaken (“to quack, croak”), German quaken (“to quack, croak”), Danish kvække (“to croak”), Swedish kväka (“to croak, quackle”), Norwegian kvekke (“to croak”), Icelandic kvaka (“to twitter, chirp, quack”).

Relationships mentioned by the source

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

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": "*quacken"
      },
      "expansion": "Middle English *quacken"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "dum",
        "3": "quacken",
        "4": "",
        "5": "to croak, quack"
      },
      "expansion": "Middle Dutch quacken (“to croak, quack”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "odt",
        "3": "*kwaken",
        "4": "",
        "5": "to croak, quack"
      },
      "expansion": "Old Dutch *kwaken (“to croak, quack”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "gmw-pro",
        "3": "*kwakōn"
      },
      "expansion": "Proto-West Germanic *kwakōn"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "gem-pro",
        "3": "*kwakaną"
      },
      "expansion": "Proto-Germanic *kwakaną"
    },
    {
      "name": "cog",
      "args": {
        "1": "stq",
        "2": "kwoakje"
      },
      "expansion": "Saterland Frisian kwoakje"
    },
    {
      "name": "cog",
      "args": {
        "1": "gml",
        "2": "quaken",
        "3": "",
        "4": "to quack, croak"
      },
      "expansion": "Middle Low German quaken (“to quack, croak”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "de",
        "2": "quaken",
        "3": "",
        "4": "to quack, croak"
      },
      "expansion": "German quaken (“to quack, croak”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "da",
        "2": "kvække",
        "3": "",
        "4": "to croak"
      },
      "expansion": "Danish kvække (“to croak”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "kväka",
        "3": "",
        "4": "to croak, quackle"
      },
      "expansion": "Swedish kväka (“to croak, quackle”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "no",
        "2": "kvekke",
        "3": "",
        "4": "to croak"
      },
      "expansion": "Norwegian kvekke (“to croak”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "kvaka",
        "3": "",
        "4": "to twitter, chirp, quack"
      },
      "expansion": "Icelandic kvaka (“to twitter, chirp, quack”)"
    }
  ],
  "links": [
    [
      "*quacken",
      "Reconstruction:Middle English/quacken"
    ],
    [
      "queken",
      "queken#Middle_English"
    ],
    [
      "quack",
      "quack#Middle_English"
    ],
    [
      "qwacke",
      "qwacke#Middle_English"
    ],
    [
      "quek",
      "quek#Middle_English"
    ],
    [
      "queke",
      "queke#Middle_English"
    ],
    [
      "kek",
      "kek#Middle_English"
    ],
    [
      "keke",
      "keke#Middle_English"
    ],
    [
      "whec-",
      "whec-#Middle_English"
    ],
    [
      "quacken",
      "quacken#Middle_Dutch"
    ],
    [
      "*kwaken",
      "Reconstruction:Old Dutch/kwaken"
    ],
    [
      "*kwakōn",
      "Reconstruction:Proto-West Germanic/kwakōn"
    ],
    [
      "*kwakaną",
      "Reconstruction:Proto-Germanic/kwakaną"
    ],
    [
      "*kwakōną",
      "Reconstruction:Proto-Germanic/kwakōną"
    ],
    [
      "kwoakje",
      "kwoakje#Saterland_Frisian"
    ],
    [
      "kwaakje",
      "kwaakje#Saterland_Frisian"
    ],
    [
      "quaken",
      "quaken#Middle_Low_German"
    ],
    [
      "quaken",
      "quaken#German"
    ],
    [
      "kvække",
      "kvække#Danish"
    ],
    [
      "kväka",
      "kväka#Swedish"
    ],
    [
      "kvekke",
      "kvekke#Norwegian"
    ],
    [
      "kvaka",
      "kvaka#Icelandic"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "Of a duck, to make its characteristic vocalisation.",
        "To make a sound similar to the quack of a duck.",
        "Of a queen bee: to make a high-pitched sound during certain stages of development."
      ],
      "tags": [
        "intransitive"
      ],
      "recordId": "350a41becf4fc8f896a9bf37550d281d2fd9f0cdfe95ab56508811c2aa91a688",
      "rawRecordSha256": "d6efc60530d9f565a14ca4e50bd664a4751b92ce603cbaedda24043ac7e499d0",
      "sourceRecordOrdinal": 17030
    },
    {
      "pos": "noun",
      "glosses": [
        "The vocalisation made by a duck."
      ],
      "tags": [],
      "recordId": "e621cee891ef8c9ebcbd5ba871c56c82b54ee1209407c58df436a8ebcc3c988b",
      "rawRecordSha256": "9c1edeabbd487c51b9bbee47abf5cf0a2ddcd13c5bcb2096483c4b1de9df093a",
      "sourceRecordOrdinal": 17029
    },
    {
      "pos": "intj",
      "glosses": [
        "A duck's quack."
      ],
      "tags": [],
      "recordId": "f01e876064560682854ef6fd24effeffa26134a51049bd283df1e8fdea100012",
      "rawRecordSha256": "879060c9cc1a0ba0bdfff6a167e900a9f4d33da8889bd003938af3317209ef82",
      "sourceRecordOrdinal": 17031
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "glosses": 0
  }
}

Source etymology 2

Original entry ↗
adj

Falsely presented as having medicinal powers.

noun

A fraudulent healer, especially a bombastic peddler in worthless treatments, a doctor who makes false diagnoses for monetary benefit, or an untrained or poorly trained doctor who uses fraudulent credentials to attract patients · Any similar charlatan or incompetent professional. · Any doctor.

verb

To practice or commit quackery (fraudulent medicine). · To make vain and loud pretensions.

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

Etymology tree Middle Dutch quacsalven Dutch quacksalverbor. English quacksalverclip. English quack Clipping of quacksalver (see there for more), of Dutch origin; ultimately related to Etymology 1 above.

Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":clip",
        "3": "quacksalver",
        "id": "fraud",
        "tree": "1",
        "text": "+",
        "nodot": "1"
      },
      "expansion": "Etymology tree\nMiddle Dutch quacsalven\nDutch quacksalverbor.\nEnglish quacksalverclip.\nEnglish quack\n[Appendix:Glossary#clipping|Clipping]] of\", \"terms\" : [ { \"children\" : [ { \"keyword_abbrev\" : \"bor.\", \"keyword_label\" : \"Borrowed from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Middle Dutch\", \"term\" : \"quacsalven\", \"status\" : \"missing\", \"lang\" : \"dum\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Dutch\", \"term\" : \"quacksalver\", \"status\" : \"inline\", \"lang\" : \"nl\" } ], \"keyword\" : \"bor\" } ], \"lang_name\" : \"English\", \"term\" : \"quacksalver\", \"status\" : \"ok\", \"lang\" : \"en\" } ], \"keyword\" : \"clipping\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"quack\", \"lang\" : \"en\" }\" data-id=\"fraud\" data-lang=\"en\" data-title=\"quack\" id=\"English:_fraud\">\nClipping of quacksalver"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "nl",
        "3": "-"
      },
      "expansion": "Dutch"
    },
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":clip",
        "3": "quacksalver",
        "id": "fraud",
        "tree": "1",
        "text": "+",
        "nodot": "1"
      },
      "expansion": "Etymology tree\nMiddle Dutch quacsalven\nDutch quacksalverbor.\nEnglish quacksalverclip.\nEnglish quack\nClipping of quacksalver"
    }
  ],
  "links": [
    [
      "quacsalven",
      "quacsalven#Middle_Dutch"
    ],
    [
      "quacksalver",
      "quacksalver#Dutch"
    ],
    [
      "quacksalver",
      "quacksalver#English"
    ],
    [
      "quacksalver",
      "quacksalver#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "adj",
      "glosses": [
        "Falsely presented as having medicinal powers."
      ],
      "tags": [],
      "recordId": "3f72cb23931a79228dbce228c8308d94a8819206538d636c731f1ca89fdd2556",
      "rawRecordSha256": "449bbd4502ab95b598acc40241e3826aab23470d29d5ef8c9215f3f1674b731d",
      "sourceRecordOrdinal": 17034
    },
    {
      "pos": "noun",
      "glosses": [
        "A fraudulent healer, especially a bombastic peddler in worthless treatments, a doctor who makes false diagnoses for monetary benefit, or an untrained or poorly trained doctor who uses fraudulent credentials to attract patients",
        "Any similar charlatan or incompetent professional.",
        "Any doctor."
      ],
      "tags": [
        "derogatory",
        "figuratively",
        "humorous",
        "mildly",
        "slang"
      ],
      "recordId": "e2d2f4396fd6533a0514f56d8ea98b447ff3854ecb6a8a0e4ae67e1c46f73d5a",
      "rawRecordSha256": "8ef67b7576b90de84773e2fb4ca41b3e25e2fea219d53489bbe12f9e83d0c5c3",
      "sourceRecordOrdinal": 17032
    },
    {
      "pos": "verb",
      "glosses": [
        "To practice or commit quackery (fraudulent medicine).",
        "To make vain and loud pretensions."
      ],
      "tags": [
        "obsolete"
      ],
      "recordId": "fe5ef1ceb86037d16af2664505722eeaefd9780045cd9cd26b466bdbb2319372",
      "rawRecordSha256": "bd1330f1cfbee2dd480dfcea62cf6161d298925dd104e75fda6520e6af00c5c9",
      "sourceRecordOrdinal": 17033
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "glosses": 0
  }
}

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 quack →

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-cXVhY2s