Noun
An unnatural, violent, and unvoluntary contraction of the muscular parts of an animal body.
Any violent and irregular motion or agitation; a violent shaking; a tumult; a commotion.
Source: Webster's dictionarythe convulsions of the stock market Source: Internet
a paroxysm of giggling Source: Internet
a fit of coughing Source: Internet
convulsions of laughter Source: Internet
After a great political convulsion such as the Norman conquest, and the following wholesale confiscation of landed estates, William needed to reassert that the rights of the Crown, which he claimed to have inherited, had not suffered in the process. Source: Internet
And then, during the daytime of the 23rd, Montallegri indicated what there had been what Weinstock describes as "a terrifying convulsion" and that death was close. Source: Internet