Longman Dictionary of Contemporary English homepage

convulsion

 noun
     
Related topics: Illness and Disability
con‧vul‧sion [countable]
1MI a shaking movement of your body that you cannot control, which happens because you are ill [= seizure]:
His temperature was very high and he went into convulsions.
2 [usually plural] a great change that affects a country:
the 19th-century political convulsions in France
3

be in convulsions

to be laughing a lot
Definition from the Longman Dictionary of Contemporary English
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