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CONVULSION

Definition:

[noun] a sudden uncontrollable attack; "a paroxysm of giggling"; "a fit of coughing"; "convulsions of laughter"
Synonyms: paroxysm, fit
[noun] violent uncontrollable contractions of muscles
[noun] a violent disturbance; "the convulsions of the stock market"
Synonyms: turmoil, upheaval
[noun] a physical disturbance such as an earthquake or upheaval