*SET-U

English word origin

Etymology of cusp

From Latin cuspis (“a point, spear, pointed end”); first used in astrology. Doublet of cuspid and cuspis.

1 source sectionExtended source reportWiktionary original ↗
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 ↗
noun

A sharp point or pointed end. · An important moment when a decision is made that will determine future events. · A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point. · A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture.

verb

To behave in a reckless or dangerous manner.

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

From Latin cuspis (“a point, spear, pointed end”); first used in astrology. Doublet of cuspid and cuspis.

Relationships mentioned by the source

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

  • Borrowed-form mentioncuspisla · a point, spear, pointed end
  • Doublet mentioncuspiden
  • Doublet mentioncuspisen

This page abbreviates 4 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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  "templates": [
    {
      "name": "bor",
      "args": {
        "1": "en",
        "2": "la",
        "3": "cuspis",
        "t": "a point, spear, pointed end"
      },
      "expansion": "Latin cuspis (“a point, spear, pointed end”)"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "cuspid",
        "3": "cuspis"
      },
      "expansion": "Doublet of cuspid and cuspis"
    }
  ],
  "links": [
    [
      "cuspis",
      "cuspis#Latin"
    ],
    [
      "cuspid",
      "cuspid#English"
    ],
    [
      "cuspis",
      "cuspis#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A sharp point or pointed end.",
        "An important moment when a decision is made that will determine future events.",
        "A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.",
        "A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture."
      ],
      "tags": [
        "figuratively"
      ],
      "recordId": "86d0a6584d3340953b19c71e7e3e6e9fc70a8c2b0a708c172edf3ca9383859ed",
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      "sourceRecordOrdinal": 229123
    },
    {
      "pos": "verb",
      "glosses": [
        "To behave in a reckless or dangerous manner."
      ],
      "tags": [
        "slang"
      ],
      "recordId": "f5ed28d8d26143b03810fd4f5c990800c6ae88ff24e3ba416b65b4e37a7bb1a5",
      "rawRecordSha256": "e21c64f6dc0a98c2e030484405dc7d097d36159f84395311bc0d92a55e5daa4e",
      "sourceRecordOrdinal": 229124
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 4,
    "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 cusp →

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-Y3VzcA