convulsion

Noun
  1. A sudden uncontrollable attack (synset 114106270)
    "a paroxysm of giggling"; "a fit of coughing"; "convulsions of laughter"
  2. Violent uncontrollable contractions of muscles (synset 114106077)
  3. A violent disturbance (synset 114001179)
    "the convulsions of the stock market"
  4. A physical disturbance such as an earthquake or upheaval (synset 107320056)

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