*SET-U

English word origin

Etymology of boo

From earlier (15c.) boh, coined to create a loud and startling sound. Compare Middle English bus! (“bang!”, interjection), Latin boō (“cry aloud, roar, shout”, verb), Ancient Greek βοάω (boáō, “shout”, verb).

5 source sectionsExtended source reportWiktionary original ↗
In this entry · 5 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 ↗
noun

A derisive shout of the word 'boo' made to indicate disapproval.

intj

A loud exclamation intended to scare someone. Usually used when one has been hidden from the target, and then appears unexpectedly. Often used in playful or jokeful context. · An exclamation used by a member of an audience, as at a stage play or sporting event, to indicate derision or disapproval.

verb

To shout extended boos derisively. · To shout extended boos at, as a form of disapproval or derision.

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

From earlier (15c.) boh, coined to create a loud and startling sound. Compare Middle English bus! (“bang!”, interjection), Latin boō (“cry aloud, roar, shout”, verb), Ancient Greek βοάω (boáō, “shout”, verb).

Inspect preserved source fields

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

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        "title": "startling"
      },
      "expansion": "startling"
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      "name": "noncog",
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    },
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      "expansion": "Latin boō (“cry aloud, roar, shout”, verb)"
    },
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        "t": "shout",
        "pos": "verb"
      },
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    }
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    ],
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      "bus!",
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    ],
    [
      "boō",
      "boo#Latin"
    ],
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      "βοάω",
      "βοάω#Ancient_Greek"
    ]
  ],
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Source etymology 2

Original entry ↗
noun

A close acquaintance or significant other.

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

From beau, from French beau. First appears c. 1988 in the Washington Post: See the cite below.

Relationships mentioned by the source

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

  • Derivation mentionbeaufr
Inspect preserved source fields

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

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Source etymology 3

Original entry ↗
noun

Cannabis.

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

Of unknown origin, possibly from boojum, from a fancied resemblance of the plants. First appears c. 1959 in Esquire Magazine.

Inspect preserved source fields

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

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Source etymology 4

Original entry ↗
verb

To make a sound characteristic of cattle; to moo.

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

Likely onomatopoeic.

Inspect preserved source fields

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

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Source etymology 5

Original entry ↗
noun

A tail feather from an ostrich.

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

Dubious; perhaps adaptation of French beau (“beautiful”).

Relationships mentioned by the source

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

  • Derivation mentionbeaufr · beautiful
Inspect preserved source fields

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

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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 boo →

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-Ym9v