Answer: convulse

AnswerCrossword Clue
CONVULSEAgitate
convulse(of an emotion, laughter, or physical stimulus) Cause (someone) to make sudden, violent, uncontrollable movements
convulseto shake violently
convulse(of a person) Suffer violent involuntary contraction of the muscles, producing contortion of the body or limbs
convulseThrow (a country) into violent social or political upheaval