convulsion

Noun

• a physical disturbance such as an earthquake or upheaval

• a violent disturbance
  • the convulsions of the stock market
    

• violent uncontrollable contractions of muscles

• a sudden uncontrollable attack
  • a paroxysm of giggling
    
  • a fit of coughing
    
  • convulsions of laughter
    

Related words

• Synonyms: 
  turmoil , upheaval , paroxysm , fit