To (cause to) shake violently with sudden uncontrolled movements. (Cambridge Dictionary)
To shake or agitate violently. (Merriam – Webster)
If someone convulses or if they are convulsed by or with something, their body moves suddenly in an uncontrolled way. (Collins Dictionary)
Suffer violent involuntary contraction of the muscles, producing contortion of the body or limbs. (Oxford Dictionaries)
Convulsive – definition and meaning.
Other words for convulse.