Webster's English Dictionary

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convulse

Cross references:
  1. shake                 
 
con.vulse \k*n-'v*ls\ vt [L convulsus, pp. of convellere to pluck up, 
   convulse, fr. com-)X + vellere to pluck : to shake or agitate violently; 
   esp : to shake with or as if wit h irregular spasms