{
  "id": "the-final-nail.threshold",
  "term": "the final nail",
  "sense": "threshold",
  "pos": "noun",
  "status": "review",
  "level": 15,
  "arena": "language",
  "domain": "emergence",
  "style": "folk",
  "definition": "A small addition that crosses a wall only because the thing was already held inside its window by nothing but tension, and no part was removed before it broke.",
  "folk_gloss": "The last thing that causes something to fail or change.",
  "emergence": {
    "components": [
      "wall.range-end",
      "parameter.condition",
      "drift.aimless",
      "maintenance.upkeep",
      "model.representation",
      "window.range"
    ],
    "interaction": "crossing without removal",
    "novel_properties": [
      "emergence.novel_properties"
    ]
  },
  "examples": [
    {
      "text": "The Tacoma Narrows Bridge collapsed in 1940 when wind-driven oscillations exceeded its structural tolerance after a single support cable failed.",
      "domain": "engineering"
    },
    {
      "text": "In 2008, Lehman Brothers filed for bankruptcy after overnight lenders refused rollover on $130 billion in debt.",
      "domain": "economics"
    },
    {
      "text": "A neuron fires an action potential when membrane potential reaches -55mV, triggering voltage-gated ion channels to open.",
      "domain": "biology"
    }
  ],
  "relations": [],
  "used_by": [],
  "forms": [
    "final nail",
    "the final nail"
  ],
  "closed": false,
  "provenance": {
    "author": "phrases:qwen/qwen3-235b-a22b-2507",
    "date": "2026-07-29",
    "confidence": 0.7,
    "sources": [
      "folk phrase — crossing without removal"
    ]
  },
  "canonical": "https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-the-final-nail.threshold"
}