*SET-U

English word origin

Etymology of flack

From Middle English flacken (“to palpitate, flutter”), from Old English *flaccian, from Proto-West Germanic *flakkōn, from Proto-Germanic *flakkōną (“to beat”), from Proto-Indo-European *pleḱ-, which could be related to

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 flutter; palpitate. · To hang loosely; flag. · To beat by flapping.

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

From Middle English flacken (“to palpitate, flutter”), from Old English *flaccian, from Proto-West Germanic *flakkōn, from Proto-Germanic *flakkōną (“to beat”), from Proto-Indo-European *pleḱ-, which could be related to Ancient Greek πλάζω (plázō, “to turn away from”). Akin to Middle Dutch vlacken (“to flicker, flash, sparkle”), Danish flakke (“to wander”), Swedish flacka (“to rove, rove about, ramble”), Icelandic flakka (“to move”). Compare also Icelandic flaka (“to flap, hang loose”), Swedish flaxa (“to flap, flutter”).

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.

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    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "flacken",
        "t": "to palpitate, flutter"
      },
      "expansion": "Middle English flacken (“to palpitate, flutter”)"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "*flaccian"
      },
      "expansion": "Old English *flaccian"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gmw-pro",
        "3": "*flakkōn"
      },
      "expansion": "Proto-West Germanic *flakkōn"
    },
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      },
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    },
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        "3": "*pleḱ-"
      },
      "expansion": "Proto-Indo-European *pleḱ-"
    },
    {
      "name": "cog",
      "args": {
        "1": "grc",
        "2": "πλάζω",
        "3": "",
        "4": "to turn away from"
      },
      "expansion": "Ancient Greek πλάζω (plázō, “to turn away from”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "dum",
        "2": "vlacken",
        "3": "",
        "4": "to flicker, flash, sparkle"
      },
      "expansion": "Middle Dutch vlacken (“to flicker, flash, sparkle”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "da",
        "2": "flakke",
        "3": "",
        "4": "to wander"
      },
      "expansion": "Danish flakke (“to wander”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "flacka",
        "3": "",
        "4": "to rove, rove about, ramble"
      },
      "expansion": "Swedish flacka (“to rove, rove about, ramble”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "flakka",
        "3": "",
        "4": "to move"
      },
      "expansion": "Icelandic flakka (“to move”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "flaka",
        "3": "",
        "4": "to flap, hang loose"
      },
      "expansion": "Icelandic flaka (“to flap, hang loose”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "flaxa",
        "3": "",
        "4": "to flap, flutter"
      },
      "expansion": "Swedish flaxa (“to flap, flutter”)"
    }
  ],
  "links": [
    [
      "flacken",
      "flacken#Middle_English"
    ],
    [
      "*flaccian",
      "Reconstruction:Old English/flaccian"
    ],
    [
      "*flakkōn",
      "Reconstruction:Proto-West Germanic/flakkōn"
    ],
    [
      "*flakkōną",
      "Reconstruction:Proto-Germanic/flakkōną"
    ],
    [
      "*pleḱ-",
      "Reconstruction:Proto-Indo-European/pleḱ-"
    ],
    [
      "πλάζω",
      "πλάζω#Ancient_Greek"
    ],
    [
      "vlacken",
      "vlacken#Middle_Dutch"
    ],
    [
      "flakke",
      "flakke#Danish"
    ],
    [
      "flacka",
      "flacka#Swedish"
    ],
    [
      "flakka",
      "flakka#Icelandic"
    ],
    [
      "flaka",
      "flaka#Icelandic"
    ],
    [
      "flaxa",
      "flaxa#Swedish"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "To flutter; palpitate.",
        "To hang loosely; flag.",
        "To beat by flapping."
      ],
      "tags": [
        "intransitive",
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        "dialectal",
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      ],
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  "omittedAuxiliaryFields": {
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}

Source etymology 2

Original entry ↗
verb

To publicise, to promote.

noun

A publicist, a publicity agent.

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

Most likely flak.

Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "wp",
      "args": {
        "1": "Public relations"
      },
      "expansion": ""
    }
  ],
  "links": [
    [
      "flak",
      "flak#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "To publicise, to promote."
      ],
      "tags": [
        "Canada",
        "US"
      ],
      "recordId": "a00064dab3d1b93467f59fc6012a7d212a998a78ab71789c45f55143af41d24c",
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      "sourceRecordOrdinal": 247433
    },
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      "pos": "noun",
      "glosses": [
        "A publicist, a publicity agent."
      ],
      "tags": [
        "Canada",
        "US"
      ],
      "recordId": "d9ffa2d5ee735b64e6efef7b2ae8cd61189fd834f9b72ff0522e6fbc0854bc4f",
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}

Source etymology 3

Original entry ↗
noun

Alternative spelling of flak.

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

Variant of flak.

Inspect preserved source fields

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

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      "args": {
        "1": "flak"
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    }
  ],
  "links": [
    [
      "flak",
      "flak#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "Alternative spelling of flak."
      ],
      "tags": [
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      ],
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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 flack →

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-ZmxhY2s