'Convulsed' in the Bible

They brought the boy to Him. When the [demonic] spirit saw Him, immediately it threw the boy into a convulsion, and falling to the ground he began rolling around and foaming at the mouth.

Even while the boy was coming, the demon slammed him down and threw him into a [violent] convulsion. But Jesus rebuked the unclean spirit, and healed the boy and gave him back to his father.