1. An abrupt failure of function or complete physical exhaustion (synset 114089685)
    "the commander's prostration demoralized his men"
  2. A natural event caused by something suddenly falling down or caving in (synset 107375728)
    "the roof is in danger of collapse"; "the collapse of the old star under its own gravity"
  3. The act of throwing yourself down (synset 100328336)
    "he landed on the bed with a great flop"
  4. A sudden large decline of business or the prices of stocks (especially one that causes additional failures) (synset 107493085)
  1. Break down, literally or metaphorically (synset 201993067)
    "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice"
  2. Collapse due to fatigue, an illness, or a sudden attack (synset 200030640)
  3. Fold or close up (synset 202087744)
    "fold up your umbrella"; "collapse the music stand"
  4. Fall apart (synset 202045722)
    "the building crumbled after the explosion"; "Negotiations broke down"
  5. Cause to burst (synset 201993576)
    "The ice broke the pipe"
  6. Suffer a nervous breakdown (synset 201789398)
  7. Lose significance, effectiveness, or value (synset 200224886)
    "The school system is collapsing"; "The stock market collapsed"

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